build: Move cli tool sources to a separate subdirectory

This unclutters the top-level directory and groups related files together.

1 files changed, 2913 insertions, 0 deletions

diff --git a/avtools/avconv.c b/avtools/avconv.c
new file mode 100644
index 0000000000..5c36761c1d
--- /dev/null
+++ b/avtools/avconv.c
@@ -0,0 +1,2913 @@
+/*
+ * avconv main
+ * Copyright (c) 2000-2011 The Libav developers
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include <ctype.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <signal.h>
+#include <limits.h>
+#include <stdint.h>
+
+#include "libavformat/avformat.h"
+#include "libavdevice/avdevice.h"
+#include "libswscale/swscale.h"
+#include "libavresample/avresample.h"
+#include "libavutil/opt.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/samplefmt.h"
+#include "libavutil/fifo.h"
+#include "libavutil/hwcontext.h"
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/dict.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/avstring.h"
+#include "libavutil/libm.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/time.h"
+#include "libavformat/os_support.h"
+
+# include "libavfilter/avfilter.h"
+# include "libavfilter/buffersrc.h"
+# include "libavfilter/buffersink.h"
+
+#if HAVE_SYS_RESOURCE_H
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/resource.h>
+#elif HAVE_GETPROCESSTIMES
+#include <windows.h>
+#endif
+#if HAVE_GETPROCESSMEMORYINFO
+#include <windows.h>
+#include <psapi.h>
+#endif
+
+#if HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
+#if HAVE_PTHREADS
+#include <pthread.h>
+#endif
+
+#include <time.h>
+
+#include "avconv.h"
+#include "cmdutils.h"
+
+#include "libavutil/avassert.h"
+
+const char program_name[] = "avconv";
+const int program_birth_year = 2000;
+
+static FILE *vstats_file;
+
+static int nb_frames_drop = 0;
+
+static int want_sdp = 1;
+
+#if HAVE_PTHREADS
+/* signal to input threads that they should exit; set by the main thread */
+static int transcoding_finished;
+#endif
+
+InputStream **input_streams = NULL;
+int        nb_input_streams = 0;
+InputFile   **input_files   = NULL;
+int        nb_input_files   = 0;
+
+OutputStream **output_streams = NULL;
+int         nb_output_streams = 0;
+OutputFile   **output_files   = NULL;
+int         nb_output_files   = 0;
+
+FilterGraph **filtergraphs;
+int        nb_filtergraphs;
+
+static void term_exit(void)
+{
+    av_log(NULL, AV_LOG_QUIET, "");
+}
+
+static volatile int received_sigterm = 0;
+static volatile int received_nb_signals = 0;
+
+static void
+sigterm_handler(int sig)
+{
+    received_sigterm = sig;
+    received_nb_signals++;
+    term_exit();
+}
+
+static void term_init(void)
+{
+    signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
+    signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
+#ifdef SIGXCPU
+    signal(SIGXCPU, sigterm_handler);
+#endif
+}
+
+static int decode_interrupt_cb(void *ctx)
+{
+    return received_nb_signals > 1;
+}
+
+const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };
+
+static void avconv_cleanup(int ret)
+{
+    int i, j;
+
+    for (i = 0; i < nb_filtergraphs; i++) {
+        FilterGraph *fg = filtergraphs[i];
+        avfilter_graph_free(&fg->graph);
+        for (j = 0; j < fg->nb_inputs; j++) {
+            while (av_fifo_size(fg->inputs[j]->frame_queue)) {
+                AVFrame *frame;
+                av_fifo_generic_read(fg->inputs[j]->frame_queue, &frame,
+                                     sizeof(frame), NULL);
+                av_frame_free(&frame);
+            }
+            av_fifo_free(fg->inputs[j]->frame_queue);
+            av_buffer_unref(&fg->inputs[j]->hw_frames_ctx);
+            av_freep(&fg->inputs[j]->name);
+            av_freep(&fg->inputs[j]);
+        }
+        av_freep(&fg->inputs);
+        for (j = 0; j < fg->nb_outputs; j++) {
+            av_freep(&fg->outputs[j]->name);
+            av_freep(&fg->outputs[j]->formats);
+            av_freep(&fg->outputs[j]->channel_layouts);
+            av_freep(&fg->outputs[j]->sample_rates);
+            av_freep(&fg->outputs[j]);
+        }
+        av_freep(&fg->outputs);
+        av_freep(&fg->graph_desc);
+
+        av_freep(&filtergraphs[i]);
+    }
+    av_freep(&filtergraphs);
+
+    /* close files */
+    for (i = 0; i < nb_output_files; i++) {
+        OutputFile *of = output_files[i];
+        AVFormatContext *s = of->ctx;
+        if (s && s->oformat && !(s->oformat->flags & AVFMT_NOFILE) && s->pb)
+            avio_close(s->pb);
+        avformat_free_context(s);
+        av_dict_free(&of->opts);
+
+        av_freep(&output_files[i]);
+    }
+    for (i = 0; i < nb_output_streams; i++) {
+        OutputStream *ost = output_streams[i];
+
+        for (j = 0; j < ost->nb_bitstream_filters; j++)
+            av_bsf_free(&ost->bsf_ctx[j]);
+        av_freep(&ost->bsf_ctx);
+
+        av_frame_free(&ost->filtered_frame);
+
+        av_parser_close(ost->parser);
+        avcodec_free_context(&ost->parser_avctx);
+
+        av_freep(&ost->forced_keyframes);
+        av_freep(&ost->avfilter);
+        av_freep(&ost->logfile_prefix);
+
+        avcodec_free_context(&ost->enc_ctx);
+
+        if (ost->muxing_queue) {
+            while (av_fifo_size(ost->muxing_queue)) {
+                AVPacket pkt;
+                av_fifo_generic_read(ost->muxing_queue, &pkt, sizeof(pkt), NULL);
+                av_packet_unref(&pkt);
+            }
+            av_fifo_free(ost->muxing_queue);
+        }
+        av_freep(&output_streams[i]);
+    }
+    for (i = 0; i < nb_input_files; i++) {
+        avformat_close_input(&input_files[i]->ctx);
+        av_freep(&input_files[i]);
+    }
+    for (i = 0; i < nb_input_streams; i++) {
+        InputStream *ist = input_streams[i];
+
+        av_frame_free(&ist->decoded_frame);
+        av_frame_free(&ist->filter_frame);
+        av_dict_free(&ist->decoder_opts);
+        av_freep(&ist->filters);
+        av_freep(&ist->hwaccel_device);
+
+        avcodec_free_context(&ist->dec_ctx);
+
+        av_freep(&input_streams[i]);
+    }
+
+    if (vstats_file)
+        fclose(vstats_file);
+    av_free(vstats_filename);
+
+    av_freep(&input_streams);
+    av_freep(&input_files);
+    av_freep(&output_streams);
+    av_freep(&output_files);
+
+    uninit_opts();
+
+    avformat_network_deinit();
+
+    if (received_sigterm) {
+        av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\n",
+               (int) received_sigterm);
+        exit (255);
+    }
+}
+
+void assert_avoptions(AVDictionary *m)
+{
+    AVDictionaryEntry *t;
+    if ((t = av_dict_get(m, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
+        av_log(NULL, AV_LOG_FATAL, "Option %s not found.\n", t->key);
+        exit_program(1);
+    }
+}
+
+static void abort_codec_experimental(AVCodec *c, int encoder)
+{
+    const char *codec_string = encoder ? "encoder" : "decoder";
+    AVCodec *codec;
+    av_log(NULL, AV_LOG_FATAL, "%s '%s' is experimental and might produce bad "
+            "results.\nAdd '-strict experimental' if you want to use it.\n",
+            codec_string, c->name);
+    codec = encoder ? avcodec_find_encoder(c->id) : avcodec_find_decoder(c->id);
+    if (!(codec->capabilities & AV_CODEC_CAP_EXPERIMENTAL))
+        av_log(NULL, AV_LOG_FATAL, "Or use the non experimental %s '%s'.\n",
+               codec_string, codec->name);
+    exit_program(1);
+}
+
+static void write_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost)
+{
+    AVFormatContext *s = of->ctx;
+    AVStream *st = ost->st;
+    int ret;
+
+    if (!of->header_written) {
+        AVPacket tmp_pkt;
+        /* the muxer is not initialized yet, buffer the packet */
+        if (!av_fifo_space(ost->muxing_queue)) {
+            int new_size = FFMIN(2 * av_fifo_size(ost->muxing_queue),
+                                 ost->max_muxing_queue_size);
+            if (new_size <= av_fifo_size(ost->muxing_queue)) {
+                av_log(NULL, AV_LOG_ERROR,
+                       "Too many packets buffered for output stream %d:%d.\n",
+                       ost->file_index, ost->st->index);
+                exit_program(1);
+            }
+            ret = av_fifo_realloc2(ost->muxing_queue, new_size);
+            if (ret < 0)
+                exit_program(1);
+        }
+        av_packet_move_ref(&tmp_pkt, pkt);
+        av_fifo_generic_write(ost->muxing_queue, &tmp_pkt, sizeof(tmp_pkt), NULL);
+        return;
+    }
+
+    /*
+     * Audio encoders may split the packets --  #frames in != #packets out.
+     * But there is no reordering, so we can limit the number of output packets
+     * by simply dropping them here.
+     * Counting encoded video frames needs to be done separately because of
+     * reordering, see do_video_out()
+     */
+    if (!(st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && ost->encoding_needed)) {
+        if (ost->frame_number >= ost->max_frames) {
+            av_packet_unref(pkt);
+            return;
+        }
+        ost->frame_number++;
+    }
+    if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+        uint8_t *sd = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_FACTOR,
+                                              NULL);
+        ost->quality = sd ? *(int *)sd : -1;
+
+        if (ost->frame_rate.num) {
+            pkt->duration = av_rescale_q(1, av_inv_q(ost->frame_rate),
+                                         ost->mux_timebase);
+        }
+    }
+
+    av_packet_rescale_ts(pkt, ost->mux_timebase, ost->st->time_base);
+
+    if (!(s->oformat->flags & AVFMT_NOTIMESTAMPS) &&
+        ost->last_mux_dts != AV_NOPTS_VALUE &&
+        pkt->dts < ost->last_mux_dts + !(s->oformat->flags & AVFMT_TS_NONSTRICT)) {
+        av_log(NULL, AV_LOG_WARNING, "Non-monotonous DTS in output stream "
+               "%d:%d; previous: %"PRId64", current: %"PRId64"; ",
+               ost->file_index, ost->st->index, ost->last_mux_dts, pkt->dts);
+        if (exit_on_error) {
+            av_log(NULL, AV_LOG_FATAL, "aborting.\n");
+            exit_program(1);
+        }
+        av_log(NULL, AV_LOG_WARNING, "changing to %"PRId64". This may result "
+               "in incorrect timestamps in the output file.\n",
+               ost->last_mux_dts + 1);
+        pkt->dts = ost->last_mux_dts + 1;
+        if (pkt->pts != AV_NOPTS_VALUE)
+            pkt->pts = FFMAX(pkt->pts, pkt->dts);
+    }
+    ost->last_mux_dts = pkt->dts;
+
+    ost->data_size += pkt->size;
+    ost->packets_written++;
+
+    pkt->stream_index = ost->index;
+
+    ret = av_interleaved_write_frame(s, pkt);
+    if (ret < 0) {
+        print_error("av_interleaved_write_frame()", ret);
+        exit_program(1);
+    }
+}
+
+static void output_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost)
+{
+    int ret = 0;
+
+    /* apply the output bitstream filters, if any */
+    if (ost->nb_bitstream_filters) {
+        int idx;
+
+        ret = av_bsf_send_packet(ost->bsf_ctx[0], pkt);
+        if (ret < 0)
+            goto finish;
+
+        idx = 1;
+        while (idx) {
+            /* get a packet from the previous filter up the chain */
+            ret = av_bsf_receive_packet(ost->bsf_ctx[idx - 1], pkt);
+            if (ret == AVERROR(EAGAIN)) {
+                ret = 0;
+                idx--;
+                continue;
+            } else if (ret < 0)
+                goto finish;
+
+            /* send it to the next filter down the chain or to the muxer */
+            if (idx < ost->nb_bitstream_filters) {
+                ret = av_bsf_send_packet(ost->bsf_ctx[idx], pkt);
+                if (ret < 0)
+                    goto finish;
+                idx++;
+            } else
+                write_packet(of, pkt, ost);
+        }
+    } else
+        write_packet(of, pkt, ost);
+
+finish:
+    if (ret < 0 && ret != AVERROR_EOF) {
+        av_log(NULL, AV_LOG_FATAL, "Error applying bitstream filters to an output "
+               "packet for stream #%d:%d.\n", ost->file_index, ost->index);
+        exit_program(1);
+    }
+}
+
+static int check_recording_time(OutputStream *ost)
+{
+    OutputFile *of = output_files[ost->file_index];
+
+    if (of->recording_time != INT64_MAX &&
+        av_compare_ts(ost->sync_opts - ost->first_pts, ost->enc_ctx->time_base, of->recording_time,
+                      AV_TIME_BASE_Q) >= 0) {
+        ost->finished = 1;
+        return 0;
+    }
+    return 1;
+}
+
+static void do_audio_out(OutputFile *of, OutputStream *ost,
+                         AVFrame *frame)
+{
+    AVCodecContext *enc = ost->enc_ctx;
+    AVPacket pkt;
+    int ret;
+
+    av_init_packet(&pkt);
+    pkt.data = NULL;
+    pkt.size = 0;
+
+    if (frame->pts == AV_NOPTS_VALUE || audio_sync_method < 0)
+        frame->pts = ost->sync_opts;
+    ost->sync_opts = frame->pts + frame->nb_samples;
+
+    ost->samples_encoded += frame->nb_samples;
+    ost->frames_encoded++;
+
+    ret = avcodec_send_frame(enc, frame);
+    if (ret < 0)
+        goto error;
+
+    while (1) {
+        ret = avcodec_receive_packet(enc, &pkt);
+        if (ret == AVERROR(EAGAIN))
+            break;
+        if (ret < 0)
+            goto error;
+
+        output_packet(of, &pkt, ost);
+    }
+
+    return;
+error:
+    av_log(NULL, AV_LOG_FATAL, "Audio encoding failed\n");
+    exit_program(1);
+}
+
+static void do_subtitle_out(OutputFile *of,
+                            OutputStream *ost,
+                            InputStream *ist,
+                            AVSubtitle *sub,
+                            int64_t pts)
+{
+    static uint8_t *subtitle_out = NULL;
+    int subtitle_out_max_size = 1024 * 1024;
+    int subtitle_out_size, nb, i;
+    AVCodecContext *enc;
+    AVPacket pkt;
+
+    if (pts == AV_NOPTS_VALUE) {
+        av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
+        if (exit_on_error)
+            exit_program(1);
+        return;
+    }
+
+    enc = ost->enc_ctx;
+
+    if (!subtitle_out) {
+        subtitle_out = av_malloc(subtitle_out_max_size);
+    }
+
+    /* Note: DVB subtitle need one packet to draw them and one other
+       packet to clear them */
+    /* XXX: signal it in the codec context ? */
+    if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
+        nb = 2;
+    else
+        nb = 1;
+
+    for (i = 0; i < nb; i++) {
+        ost->sync_opts = av_rescale_q(pts, ist->st->time_base, enc->time_base);
+        if (!check_recording_time(ost))
+            return;
+
+        sub->pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q);
+        // start_display_time is required to be 0
+        sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
+        sub->end_display_time  -= sub->start_display_time;
+        sub->start_display_time = 0;
+
+        ost->frames_encoded++;
+
+        subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
+                                                    subtitle_out_max_size, sub);
+        if (subtitle_out_size < 0) {
+            av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
+            exit_program(1);
+        }
+
+        av_init_packet(&pkt);
+        pkt.data = subtitle_out;
+        pkt.size = subtitle_out_size;
+        pkt.pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->mux_timebase);
+        if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
+            /* XXX: the pts correction is handled here. Maybe handling
+               it in the codec would be better */
+            if (i == 0)
+                pkt.pts += 90 * sub->start_display_time;
+            else
+                pkt.pts += 90 * sub->end_display_time;
+        }
+        output_packet(of, &pkt, ost);
+    }
+}
+
+static void do_video_out(OutputFile *of,
+                         OutputStream *ost,
+                         AVFrame *in_picture,
+                         int *frame_size)
+{
+    int ret, format_video_sync;
+    AVPacket pkt;
+    AVCodecContext *enc = ost->enc_ctx;
+
+    *frame_size = 0;
+
+    format_video_sync = video_sync_method;
+    if (format_video_sync == VSYNC_AUTO)
+        format_video_sync = (of->ctx->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH :
+                            (of->ctx->oformat->flags & AVFMT_VARIABLE_FPS) ? VSYNC_VFR : VSYNC_CFR;
+    if (format_video_sync != VSYNC_PASSTHROUGH &&
+        ost->frame_number &&
+        in_picture->pts != AV_NOPTS_VALUE &&
+        in_picture->pts < ost->sync_opts) {
+        nb_frames_drop++;
+        av_log(NULL, AV_LOG_WARNING,
+               "*** dropping frame %d from stream %d at ts %"PRId64"\n",
+               ost->frame_number, ost->st->index, in_picture->pts);
+        return;
+    }
+
+    if (in_picture->pts == AV_NOPTS_VALUE)
+        in_picture->pts = ost->sync_opts;
+    ost->sync_opts = in_picture->pts;
+
+
+    if (!ost->frame_number)
+        ost->first_pts = in_picture->pts;
+
+    av_init_packet(&pkt);
+    pkt.data = NULL;
+    pkt.size = 0;
+
+    if (ost->frame_number >= ost->max_frames)
+        return;
+
+    if (enc->flags & (AV_CODEC_FLAG_INTERLACED_DCT | AV_CODEC_FLAG_INTERLACED_ME) &&
+        ost->top_field_first >= 0)
+        in_picture->top_field_first = !!ost->top_field_first;
+
+    in_picture->quality = enc->global_quality;
+    in_picture->pict_type = 0;
+    if (ost->forced_kf_index < ost->forced_kf_count &&
+        in_picture->pts >= ost->forced_kf_pts[ost->forced_kf_index]) {
+        in_picture->pict_type = AV_PICTURE_TYPE_I;
+        ost->forced_kf_index++;
+    }
+
+    ost->frames_encoded++;
+
+    ret = avcodec_send_frame(enc, in_picture);
+    if (ret < 0)
+        goto error;
+
+    /*
+     * For video, there may be reordering, so we can't throw away frames on
+     * encoder flush, we need to limit them here, before they go into encoder.
+     */
+    ost->frame_number++;
+
+    while (1) {
+        ret = avcodec_receive_packet(enc, &pkt);
+        if (ret == AVERROR(EAGAIN))
+            break;
+        if (ret < 0)
+            goto error;
+
+        output_packet(of, &pkt, ost);
+        *frame_size = pkt.size;
+
+        /* if two pass, output log */
+        if (ost->logfile && enc->stats_out) {
+            fprintf(ost->logfile, "%s", enc->stats_out);
+        }
+
+        ost->sync_opts++;
+    }
+
+    return;
+error:
+    av_assert0(ret != AVERROR(EAGAIN) && ret != AVERROR_EOF);
+    av_log(NULL, AV_LOG_FATAL, "Video encoding failed\n");
+    exit_program(1);
+}
+
+#if FF_API_CODED_FRAME && FF_API_ERROR_FRAME
+static double psnr(double d)
+{
+    return -10.0 * log(d) / log(10.0);
+}
+#endif
+
+static void do_video_stats(OutputStream *ost, int frame_size)
+{
+    AVCodecContext *enc;
+    int frame_number;
+    double ti1, bitrate, avg_bitrate;
+
+    /* this is executed just the first time do_video_stats is called */
+    if (!vstats_file) {
+        vstats_file = fopen(vstats_filename, "w");
+        if (!vstats_file) {
+            perror("fopen");
+            exit_program(1);
+        }
+    }
+
+    enc = ost->enc_ctx;
+    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
+        frame_number = ost->frame_number;
+        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number,
+                ost->quality / (float)FF_QP2LAMBDA);
+
+#if FF_API_CODED_FRAME && FF_API_ERROR_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+        if (enc->flags & AV_CODEC_FLAG_PSNR)
+            fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0] / (enc->width * enc->height * 255.0 * 255.0)));
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+
+        fprintf(vstats_file,"f_size= %6d ", frame_size);
+        /* compute pts value */
+        ti1 = ost->sync_opts * av_q2d(enc->time_base);
+        if (ti1 < 0.01)
+            ti1 = 0.01;
+
+        bitrate     = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
+        avg_bitrate = (double)(ost->data_size * 8) / ti1 / 1000.0;
+        fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
+               (double)ost->data_size / 1024, ti1, bitrate, avg_bitrate);
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+        fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    }
+}
+
+static int init_output_stream(OutputStream *ost, char *error, int error_len);
+
+/*
+ * Read one frame for lavfi output for ost and encode it.
+ */
+static int poll_filter(OutputStream *ost)
+{
+    OutputFile    *of = output_files[ost->file_index];
+    AVFrame *filtered_frame = NULL;
+    int frame_size, ret;
+
+    if (!ost->filtered_frame && !(ost->filtered_frame = av_frame_alloc())) {
+        return AVERROR(ENOMEM);
+    }
+    filtered_frame = ost->filtered_frame;
+
+    if (!ost->initialized) {
+        char error[1024];
+        ret = init_output_stream(ost, error, sizeof(error));
+        if (ret < 0) {
+            av_log(NULL, AV_LOG_ERROR, "Error initializing output stream %d:%d -- %s\n",
+                   ost->file_index, ost->index, error);
+            exit_program(1);
+        }
+    }
+
+    if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
+        !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
+        ret = av_buffersink_get_samples(ost->filter->filter, filtered_frame,
+                                         ost->enc_ctx->frame_size);
+    else
+        ret = av_buffersink_get_frame(ost->filter->filter, filtered_frame);
+
+    if (ret < 0)
+        return ret;
+
+    if (filtered_frame->pts != AV_NOPTS_VALUE) {
+        int64_t start_time = (of->start_time == AV_NOPTS_VALUE) ? 0 : of->start_time;
+        filtered_frame->pts = av_rescale_q(filtered_frame->pts,
+                                           ost->filter->filter->inputs[0]->time_base,
+                                           ost->enc_ctx->time_base) -
+                              av_rescale_q(start_time,
+                                           AV_TIME_BASE_Q,
+                                           ost->enc_ctx->time_base);
+    }
+
+    switch (ost->filter->filter->inputs[0]->type) {
+    case AVMEDIA_TYPE_VIDEO:
+        if (!ost->frame_aspect_ratio)
+            ost->enc_ctx->sample_aspect_ratio = filtered_frame->sample_aspect_ratio;
+
+        do_video_out(of, ost, filtered_frame, &frame_size);
+        if (vstats_filename && frame_size)
+            do_video_stats(ost, frame_size);
+        break;
+    case AVMEDIA_TYPE_AUDIO:
+        do_audio_out(of, ost, filtered_frame);
+        break;
+    default:
+        // TODO support subtitle filters
+        av_assert0(0);
+    }
+
+    av_frame_unref(filtered_frame);
+
+    return 0;
+}
+
+static void finish_output_stream(OutputStream *ost)
+{
+    OutputFile *of = output_files[ost->file_index];
+    int i;
+
+    ost->finished = 1;
+
+    if (of->shortest) {
+        for (i = 0; i < of->ctx->nb_streams; i++)
+            output_streams[of->ost_index + i]->finished = 1;
+    }
+}
+
+/*
+ * Read as many frames from possible from lavfi and encode them.
+ *
+ * Always read from the active stream with the lowest timestamp. If no frames
+ * are available for it then return EAGAIN and wait for more input. This way we
+ * can use lavfi sources that generate unlimited amount of frames without memory
+ * usage exploding.
+ */
+static int poll_filters(void)
+{
+    int i, ret = 0;
+
+    while (ret >= 0 && !received_sigterm) {
+        OutputStream *ost = NULL;
+        int64_t min_pts = INT64_MAX;
+
+        /* choose output stream with the lowest timestamp */
+        for (i = 0; i < nb_output_streams; i++) {
+            int64_t pts = output_streams[i]->sync_opts;
+
+            if (output_streams[i]->filter && !output_streams[i]->filter->graph->graph &&
+                !output_streams[i]->filter->graph->nb_inputs) {
+                ret = configure_filtergraph(output_streams[i]->filter->graph);
+                if (ret < 0) {
+                    av_log(NULL, AV_LOG_ERROR, "Error reinitializing filters!\n");
+                    return ret;
+                }
+            }
+
+            if (!output_streams[i]->filter || output_streams[i]->finished ||
+                !output_streams[i]->filter->graph->graph)
+                continue;
+
+            pts = av_rescale_q(pts, output_streams[i]->enc_ctx->time_base,
+                               AV_TIME_BASE_Q);
+            if (pts < min_pts) {
+                min_pts = pts;
+                ost = output_streams[i];
+            }
+        }
+
+        if (!ost)
+            break;
+
+        ret = poll_filter(ost);
+
+        if (ret == AVERROR_EOF) {
+            finish_output_stream(ost);
+            ret = 0;
+        } else if (ret == AVERROR(EAGAIN))
+            return 0;
+    }
+
+    return ret;
+}
+
+static void print_final_stats(int64_t total_size)
+{
+    uint64_t video_size = 0, audio_size = 0, extra_size = 0, other_size = 0;
+    uint64_t data_size = 0;
+    float percent = -1.0;
+    int i, j;
+
+    for (i = 0; i < nb_output_streams; i++) {
+        OutputStream *ost = output_streams[i];
+        switch (ost->enc_ctx->codec_type) {
+            case AVMEDIA_TYPE_VIDEO: video_size += ost->data_size; break;
+            case AVMEDIA_TYPE_AUDIO: audio_size += ost->data_size; break;
+            default:                 other_size += ost->data_size; break;
+        }
+        extra_size += ost->enc_ctx->extradata_size;
+        data_size  += ost->data_size;
+    }
+
+    if (data_size && total_size >= data_size)
+        percent = 100.0 * (total_size - data_size) / data_size;
+
+    av_log(NULL, AV_LOG_INFO, "\n");
+    av_log(NULL, AV_LOG_INFO, "video:%1.0fkB audio:%1.0fkB other streams:%1.0fkB global headers:%1.0fkB muxing overhead: ",
+           video_size / 1024.0,
+           audio_size / 1024.0,
+           other_size / 1024.0,
+           extra_size / 1024.0);
+    if (percent >= 0.0)
+        av_log(NULL, AV_LOG_INFO, "%f%%", percent);
+    else
+        av_log(NULL, AV_LOG_INFO, "unknown");
+    av_log(NULL, AV_LOG_INFO, "\n");
+
+    /* print verbose per-stream stats */
+    for (i = 0; i < nb_input_files; i++) {
+        InputFile *f = input_files[i];
+        uint64_t total_packets = 0, total_size = 0;
+
+        av_log(NULL, AV_LOG_VERBOSE, "Input file #%d (%s):\n",
+               i, f->ctx->filename);
+
+        for (j = 0; j < f->nb_streams; j++) {
+            InputStream *ist = input_streams[f->ist_index + j];
+            enum AVMediaType type = ist->dec_ctx->codec_type;
+
+            total_size    += ist->data_size;
+            total_packets += ist->nb_packets;
+
+            av_log(NULL, AV_LOG_VERBOSE, "  Input stream #%d:%d (%s): ",
+                   i, j, media_type_string(type));
+            av_log(NULL, AV_LOG_VERBOSE, "%"PRIu64" packets read (%"PRIu64" bytes); ",
+                   ist->nb_packets, ist->data_size);
+
+            if (ist->decoding_needed) {
+                av_log(NULL, AV_LOG_VERBOSE, "%"PRIu64" frames decoded",
+                       ist->frames_decoded);
+                if (type == AVMEDIA_TYPE_AUDIO)
+                    av_log(NULL, AV_LOG_VERBOSE, " (%"PRIu64" samples)", ist->samples_decoded);
+                av_log(NULL, AV_LOG_VERBOSE, "; ");
+            }
+
+            av_log(NULL, AV_LOG_VERBOSE, "\n");
+        }
+
+        av_log(NULL, AV_LOG_VERBOSE, "  Total: %"PRIu64" packets (%"PRIu64" bytes) demuxed\n",
+               total_packets, total_size);
+    }
+
+    for (i = 0; i < nb_output_files; i++) {
+        OutputFile *of = output_files[i];
+        uint64_t total_packets = 0, total_size = 0;
+
+        av_log(NULL, AV_LOG_VERBOSE, "Output file #%d (%s):\n",
+               i, of->ctx->filename);
+
+        for (j = 0; j < of->ctx->nb_streams; j++) {
+            OutputStream *ost = output_streams[of->ost_index + j];
+            enum AVMediaType type = ost->enc_ctx->codec_type;
+
+            total_size    += ost->data_size;
+            total_packets += ost->packets_written;
+
+            av_log(NULL, AV_LOG_VERBOSE, "  Output stream #%d:%d (%s): ",
+                   i, j, media_type_string(type));
+            if (ost->encoding_needed) {
+                av_log(NULL, AV_LOG_VERBOSE, "%"PRIu64" frames encoded",
+                       ost->frames_encoded);
+                if (type == AVMEDIA_TYPE_AUDIO)
+                    av_log(NULL, AV_LOG_VERBOSE, " (%"PRIu64" samples)", ost->samples_encoded);
+                av_log(NULL, AV_LOG_VERBOSE, "; ");
+            }
+
+            av_log(NULL, AV_LOG_VERBOSE, "%"PRIu64" packets muxed (%"PRIu64" bytes); ",
+                   ost->packets_written, ost->data_size);
+
+            av_log(NULL, AV_LOG_VERBOSE, "\n");
+        }
+
+        av_log(NULL, AV_LOG_VERBOSE, "  Total: %"PRIu64" packets (%"PRIu64" bytes) muxed\n",
+               total_packets, total_size);
+    }
+}
+
+static void print_report(int is_last_report, int64_t timer_start)
+{
+    char buf[1024];
+    OutputStream *ost;
+    AVFormatContext *oc;
+    int64_t total_size = 0;
+    AVCodecContext *enc;
+    int frame_number, vid, i;
+    double bitrate, ti1, pts;
+    static int64_t last_time = -1;
+    static int qp_histogram[52];
+
+    if (!print_stats && !is_last_report)
+        return;
+
+    if (!is_last_report) {
+        int64_t cur_time;
+        /* display the report every 0.5 seconds */
+        cur_time = av_gettime_relative();
+        if (last_time == -1) {
+            last_time = cur_time;
+            return;
+        }
+        if ((cur_time - last_time) < 500000)
+            return;
+        last_time = cur_time;
+    }
+
+
+    oc = output_files[0]->ctx;
+    if (oc->pb) {
+        total_size = avio_size(oc->pb);
+        if (total_size <= 0) // FIXME improve avio_size() so it works with non seekable output too
+            total_size = avio_tell(oc->pb);
+        if (total_size < 0) {
+            char errbuf[128];
+            av_strerror(total_size, errbuf, sizeof(errbuf));
+            av_log(NULL, AV_LOG_VERBOSE, "Bitrate not available, "
+                   "avio_tell() failed: %s\n", errbuf);
+            total_size = 0;
+        }
+    }
+
+    buf[0] = '\0';
+    ti1 = 1e10;
+    vid = 0;
+    for (i = 0; i < nb_output_streams; i++) {
+        float q = -1;
+        ost = output_streams[i];
+        enc = ost->enc_ctx;
+        if (!ost->stream_copy)
+            q = ost->quality / (float) FF_QP2LAMBDA;
+
+        if (vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
+            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "q=%2.1f ", q);
+        }
+        if (!vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
+            float t = (av_gettime_relative() - timer_start) / 1000000.0;
+
+            frame_number = ost->frame_number;
+            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "frame=%5d fps=%3d q=%3.1f ",
+                     frame_number, (t > 1) ? (int)(frame_number / t + 0.5) : 0, q);
+            if (is_last_report)
+                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "L");
+            if (qp_hist) {
+                int j;
+                int qp = lrintf(q);
+                if (qp >= 0 && qp < FF_ARRAY_ELEMS(qp_histogram))
+                    qp_histogram[qp]++;
+                for (j = 0; j < 32; j++)
+                    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%X", (int)lrintf(log2(qp_histogram[j] + 1)));
+            }
+
+#if FF_API_CODED_FRAME && FF_API_ERROR_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
+            if (enc->flags & AV_CODEC_FLAG_PSNR) {
+                int j;
+                double error, error_sum = 0;
+                double scale, scale_sum = 0;
+                char type[3] = { 'Y','U','V' };
+                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "PSNR=");
+                for (j = 0; j < 3; j++) {
+                    if (is_last_report) {
+                        error = enc->error[j];
+                        scale = enc->width * enc->height * 255.0 * 255.0 * frame_number;
+                    } else {
+                        error = enc->coded_frame->error[j];
+                        scale = enc->width * enc->height * 255.0 * 255.0;
+                    }
+                    if (j)
+                        scale /= 4;
+                    error_sum += error;
+                    scale_sum += scale;
+                    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%c:%2.2f ", type[j], psnr(error / scale));
+                }
+                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "*:%2.2f ", psnr(error_sum / scale_sum));
+            }
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+            vid = 1;
+        }
+        /* compute min output value */
+        pts = (double)ost->last_mux_dts * av_q2d(ost->st->time_base);
+        if ((pts < ti1) && (pts > 0))
+            ti1 = pts;
+    }
+    if (ti1 < 0.01)
+        ti1 = 0.01;
+
+    bitrate = (double)(total_size * 8) / ti1 / 1000.0;
+
+    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
+            "size=%8.0fkB time=%0.2f bitrate=%6.1fkbits/s",
+            (double)total_size / 1024, ti1, bitrate);
+
+    if (nb_frames_drop)
+        snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " drop=%d",
+                 nb_frames_drop);
+
+    av_log(NULL, AV_LOG_INFO, "%s    \r", buf);
+
+    fflush(stderr);
+
+    if (is_last_report)
+        print_final_stats(total_size);
+
+}
+
+static void flush_encoders(void)
+{
+    int i, ret;
+
+    for (i = 0; i < nb_output_streams; i++) {
+        OutputStream   *ost = output_streams[i];
+        AVCodecContext *enc = ost->enc_ctx;
+        OutputFile      *of = output_files[ost->file_index];
+        int stop_encoding = 0;
+
+        if (!ost->encoding_needed)
+            continue;
+
+        if (enc->codec_type == AVMEDIA_TYPE_AUDIO && enc->frame_size <= 1)
+            continue;
+
+        if (enc->codec_type != AVMEDIA_TYPE_VIDEO && enc->codec_type != AVMEDIA_TYPE_AUDIO)
+            continue;
+
+        avcodec_send_frame(enc, NULL);
+
+        for (;;) {
+            const char *desc = NULL;
+
+            switch (enc->codec_type) {
+            case AVMEDIA_TYPE_AUDIO:
+                desc   = "Audio";
+                break;
+            case AVMEDIA_TYPE_VIDEO:
+                desc   = "Video";
+                break;
+            default:
+                av_assert0(0);
+            }
+
+            if (1) {
+                AVPacket pkt;
+                av_init_packet(&pkt);
+                pkt.data = NULL;
+                pkt.size = 0;
+
+                ret = avcodec_receive_packet(enc, &pkt);
+                if (ret < 0 && ret != AVERROR_EOF) {
+                    av_log(NULL, AV_LOG_FATAL, "%s encoding failed\n", desc);
+                    exit_program(1);
+                }
+                if (ost->logfile && enc->stats_out) {
+                    fprintf(ost->logfile, "%s", enc->stats_out);
+                }
+                if (ret == AVERROR_EOF) {
+                    stop_encoding = 1;
+                    break;
+                }
+                output_packet(of, &pkt, ost);
+            }
+
+            if (stop_encoding)
+                break;
+        }
+    }
+}
+
+/*
+ * Check whether a packet from ist should be written into ost at this time
+ */
+static int check_output_constraints(InputStream *ist, OutputStream *ost)
+{
+    OutputFile *of = output_files[ost->file_index];
+    int ist_index  = input_files[ist->file_index]->ist_index + ist->st->index;
+
+    if (ost->source_index != ist_index)
+        return 0;
+
+    if (of->start_time != AV_NOPTS_VALUE && ist->last_dts < of->start_time)
+        return 0;
+
+    return 1;
+}
+
+static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *pkt)
+{
+    OutputFile *of = output_files[ost->file_index];
+    InputFile   *f = input_files [ist->file_index];
+    int64_t start_time = (of->start_time == AV_NOPTS_VALUE) ? 0 : of->start_time;
+    int64_t ost_tb_start_time = av_rescale_q(start_time, AV_TIME_BASE_Q, ost->mux_timebase);
+    AVPacket opkt;
+
+    av_init_packet(&opkt);
+
+    if ((!ost->frame_number && !(pkt->flags & AV_PKT_FLAG_KEY)) &&
+        !ost->copy_initial_nonkeyframes)
+        return;
+
+    if (of->recording_time != INT64_MAX &&
+        ist->last_dts >= of->recording_time + start_time) {
+        ost->finished = 1;
+        return;
+    }
+
+    if (f->recording_time != INT64_MAX) {
+        start_time = f->ctx->start_time;
+        if (f->start_time != AV_NOPTS_VALUE)
+            start_time += f->start_time;
+        if (ist->last_dts >= f->recording_time + start_time) {
+            ost->finished = 1;
+            return;
+        }
+    }
+
+    /* force the input stream PTS */
+    if (ost->enc_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
+        ost->sync_opts++;
+
+    if (pkt->pts != AV_NOPTS_VALUE)
+        opkt.pts = av_rescale_q(pkt->pts, ist->st->time_base, ost->mux_timebase) - ost_tb_start_time;
+    else
+        opkt.pts = AV_NOPTS_VALUE;
+
+    if (pkt->dts == AV_NOPTS_VALUE)
+        opkt.dts = av_rescale_q(ist->last_dts, AV_TIME_BASE_Q, ost->mux_timebase);
+    else
+        opkt.dts = av_rescale_q(pkt->dts, ist->st->time_base, ost->mux_timebase);
+    opkt.dts -= ost_tb_start_time;
+
+    opkt.duration = av_rescale_q(pkt->duration, ist->st->time_base, ost->mux_timebase);
+    opkt.flags    = pkt->flags;
+
+    // FIXME remove the following 2 lines they shall be replaced by the bitstream filters
+    if (  ost->enc_ctx->codec_id != AV_CODEC_ID_H264
+       && ost->enc_ctx->codec_id != AV_CODEC_ID_MPEG1VIDEO
+       && ost->enc_ctx->codec_id != AV_CODEC_ID_MPEG2VIDEO
+       && ost->enc_ctx->codec_id != AV_CODEC_ID_VC1
+       ) {
+        if (av_parser_change(ost->parser, ost->parser_avctx,
+                             &opkt.data, &opkt.size,
+                             pkt->data, pkt->size,
+                             pkt->flags & AV_PKT_FLAG_KEY)) {
+            opkt.buf = av_buffer_create(opkt.data, opkt.size, av_buffer_default_free, NULL, 0);
+            if (!opkt.buf)
+                exit_program(1);
+        }
+    } else {
+        opkt.data = pkt->data;
+        opkt.size = pkt->size;
+    }
+
+    output_packet(of, &opkt, ost);
+}
+
+static int ifilter_send_frame(InputFilter *ifilter, AVFrame *frame)
+{
+    FilterGraph *fg = ifilter->graph;
+    int need_reinit, ret, i;
+
+    /* determine if the parameters for this input changed */
+    need_reinit = ifilter->format != frame->format;
+    if (!!ifilter->hw_frames_ctx != !!frame->hw_frames_ctx ||
+        (ifilter->hw_frames_ctx && ifilter->hw_frames_ctx->data != frame->hw_frames_ctx->data))
+        need_reinit = 1;
+
+    switch (ifilter->ist->st->codecpar->codec_type) {
+    case AVMEDIA_TYPE_AUDIO:
+        need_reinit |= ifilter->sample_rate    != frame->sample_rate ||
+                       ifilter->channel_layout != frame->channel_layout;
+        break;
+    case AVMEDIA_TYPE_VIDEO:
+        need_reinit |= ifilter->width  != frame->width ||
+                       ifilter->height != frame->height;
+        break;
+    }
+
+    if (need_reinit) {
+        ret = ifilter_parameters_from_frame(ifilter, frame);
+        if (ret < 0)
+            return ret;
+    }
+
+    /* (re)init the graph if possible, otherwise buffer the frame and return */
+    if (need_reinit || !fg->graph) {
+        for (i = 0; i < fg->nb_inputs; i++) {
+            if (fg->inputs[i]->format < 0) {
+                AVFrame *tmp = av_frame_clone(frame);
+                if (!tmp)
+                    return AVERROR(ENOMEM);
+                av_frame_unref(frame);
+
+                if (!av_fifo_space(ifilter->frame_queue)) {
+                    ret = av_fifo_realloc2(ifilter->frame_queue, 2 * av_fifo_size(ifilter->frame_queue));
+                    if (ret < 0)
+                        return ret;
+                }
+                av_fifo_generic_write(ifilter->frame_queue, &tmp, sizeof(tmp), NULL);
+                return 0;
+            }
+        }
+
+        ret = poll_filters();
+        if (ret < 0 && ret != AVERROR_EOF) {
+            char errbuf[128];
+            av_strerror(ret, errbuf, sizeof(errbuf));
+
+            av_log(NULL, AV_LOG_ERROR, "Error while filtering: %s\n", errbuf);
+            return ret;
+        }
+
+        ret = configure_filtergraph(fg);
+        if (ret < 0) {
+            av_log(NULL, AV_LOG_ERROR, "Error reinitializing filters!\n");
+            return ret;
+        }
+    }
+
+    ret = av_buffersrc_add_frame(ifilter->filter, frame);
+    if (ret < 0) {
+        av_log(NULL, AV_LOG_ERROR, "Error while filtering\n");
+        return ret;
+    }
+
+    return 0;
+}
+
+static int ifilter_send_eof(InputFilter *ifilter)
+{
+    int i, j, ret;
+
+    ifilter->eof = 1;
+
+    if (ifilter->filter) {
+        ret = av_buffersrc_add_frame(ifilter->filter, NULL);
+        if (ret < 0)
+            return ret;
+    } else {
+        // the filtergraph was never configured
+        FilterGraph *fg = ifilter->graph;
+        for (i = 0; i < fg->nb_inputs; i++)
+            if (!fg->inputs[i]->eof)
+                break;
+        if (i == fg->nb_inputs) {
+            // All the input streams have finished without the filtergraph
+            // ever being configured.
+            // Mark the output streams as finished.
+            for (j = 0; j < fg->nb_outputs; j++)
+                finish_output_stream(fg->outputs[j]->ost);
+        }
+    }
+
+    return 0;
+}
+
+// This does not quite work like avcodec_decode_audio4/avcodec_decode_video2.
+// There is the following difference: if you got a frame, you must call
+// it again with pkt=NULL. pkt==NULL is treated differently from pkt.size==0
+// (pkt==NULL means get more output, pkt.size==0 is a flush/drain packet)
+static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
+{
+    int ret;
+
+    *got_frame = 0;
+
+    if (pkt) {
+        ret = avcodec_send_packet(avctx, pkt);
+        // In particular, we don't expect AVERROR(EAGAIN), because we read all
+        // decoded frames with avcodec_receive_frame() until done.
+        if (ret < 0)
+            return ret == AVERROR_EOF ? 0 : ret;
+    }
+
+    ret = avcodec_receive_frame(avctx, frame);
+    if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
+        return ret;
+    if (ret >= 0)
+        *got_frame = 1;
+
+    return 0;
+}
+
+int guess_input_channel_layout(InputStream *ist)
+{
+    AVCodecContext *dec = ist->dec_ctx;
+
+    if (!dec->channel_layout) {
+        char layout_name[256];
+
+        dec->channel_layout = av_get_default_channel_layout(dec->channels);
+        if (!dec->channel_layout)
+            return 0;
+        av_get_channel_layout_string(layout_name, sizeof(layout_name),
+                                     dec->channels, dec->channel_layout);
+        av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for Input Stream "
+               "#%d.%d : %s\n", ist->file_index, ist->st->index, layout_name);
+    }
+    return 1;
+}
+
+static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output,
+                        int *decode_failed)
+{
+    AVFrame *decoded_frame, *f;
+    AVCodecContext *avctx = ist->dec_ctx;
+    int i, ret, err = 0;
+
+    if (!ist->decoded_frame && !(ist->decoded_frame = av_frame_alloc()))
+        return AVERROR(ENOMEM);
+    if (!ist->filter_frame && !(ist->filter_frame = av_frame_alloc()))
+        return AVERROR(ENOMEM);
+    decoded_frame = ist->decoded_frame;
+
+    ret = decode(avctx, decoded_frame, got_output, pkt);
+    if (ret < 0)
+        *decode_failed = 1;
+    if (!*got_output || ret < 0)
+        return ret;
+
+    ist->samples_decoded += decoded_frame->nb_samples;
+    ist->frames_decoded++;
+
+    /* if the decoder provides a pts, use it instead of the last packet pts.
+       the decoder could be delaying output by a packet or more. */
+    if (decoded_frame->pts != AV_NOPTS_VALUE)
+        ist->next_dts = av_rescale_q(decoded_frame->pts, ist->st->time_base, AV_TIME_BASE_Q);
+    else if (pkt && pkt->pts != AV_NOPTS_VALUE) {
+        decoded_frame->pts = pkt->pts;
+    }
+
+    if (decoded_frame->pts != AV_NOPTS_VALUE)
+        decoded_frame->pts = av_rescale_q(decoded_frame->pts,
+                                          ist->st->time_base,
+                                          (AVRational){1, avctx->sample_rate});
+    ist->nb_samples = decoded_frame->nb_samples;
+    for (i = 0; i < ist->nb_filters; i++) {
+        if (i < ist->nb_filters - 1) {
+            f = ist->filter_frame;
+            err = av_frame_ref(f, decoded_frame);
+            if (err < 0)
+                break;
+        } else
+            f = decoded_frame;
+
+        err = ifilter_send_frame(ist->filters[i], f);
+        if (err < 0)
+            break;
+    }
+
+    av_frame_unref(ist->filter_frame);
+    av_frame_unref(decoded_frame);
+    return err < 0 ? err : ret;
+}
+
+static int decode_video(InputStream *ist, AVPacket *pkt, int *got_output,
+                        int *decode_failed)
+{
+    AVFrame *decoded_frame, *f;
+    int i, ret = 0, err = 0;
+
+    if (!ist->decoded_frame && !(ist->decoded_frame = av_frame_alloc()))
+        return AVERROR(ENOMEM);
+    if (!ist->filter_frame && !(ist->filter_frame = av_frame_alloc()))
+        return AVERROR(ENOMEM);
+    decoded_frame = ist->decoded_frame;
+
+    ret = decode(ist->dec_ctx, decoded_frame, got_output, pkt);
+    if (ret < 0)
+        *decode_failed = 1;
+    if (!*got_output || ret < 0)
+        return ret;
+
+    ist->frames_decoded++;
+
+    if (ist->hwaccel_retrieve_data && decoded_frame->format == ist->hwaccel_pix_fmt) {
+        err = ist->hwaccel_retrieve_data(ist->dec_ctx, decoded_frame);
+        if (err < 0)
+            goto fail;
+    }
+    ist->hwaccel_retrieved_pix_fmt = decoded_frame->format;
+
+    decoded_frame->pts = guess_correct_pts(&ist->pts_ctx, decoded_frame->pts,
+                                           decoded_frame->pkt_dts);
+    if (ist->framerate.num)
+        decoded_frame->pts = ist->cfr_next_pts++;
+
+    if (ist->st->sample_aspect_ratio.num)
+        decoded_frame->sample_aspect_ratio = ist->st->sample_aspect_ratio;
+
+    for (i = 0; i < ist->nb_filters; i++) {
+        if (i < ist->nb_filters - 1) {
+            f = ist->filter_frame;
+            err = av_frame_ref(f, decoded_frame);
+            if (err < 0)
+                break;
+        } else
+            f = decoded_frame;
+
+        err = ifilter_send_frame(ist->filters[i], f);
+        if (err < 0)
+            break;
+    }
+
+fail:
+    av_frame_unref(ist->filter_frame);
+    av_frame_unref(decoded_frame);
+    return err < 0 ? err : ret;
+}
+
+static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output,
+                               int *decode_failed)
+{
+    AVSubtitle subtitle;
+    int i, ret = avcodec_decode_subtitle2(ist->dec_ctx,
+                                          &subtitle, got_output, pkt);
+    if (ret < 0) {
+        *decode_failed = 1;
+        return ret;
+    }
+    if (!*got_output)
+        return ret;
+
+    ist->frames_decoded++;
+
+    for (i = 0; i < nb_output_streams; i++) {
+        OutputStream *ost = output_streams[i];
+
+        if (!check_output_constraints(ist, ost) || !ost->encoding_needed)
+            continue;
+
+        do_subtitle_out(output_files[ost->file_index], ost, ist, &subtitle, pkt->pts);
+    }
+
+    avsubtitle_free(&subtitle);
+    return ret;
+}
+
+static int send_filter_eof(InputStream *ist)
+{
+    int i, ret;
+    for (i = 0; i < ist->nb_filters; i++) {
+        ret = ifilter_send_eof(ist->filters[i]);
+        if (ret < 0)
+            return ret;
+    }
+    return 0;
+}
+
+/* pkt = NULL means EOF (needed to flush decoder buffers) */
+static void process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eof)
+{
+    int i;
+    int repeating = 0;
+    AVPacket avpkt;
+
+    if (ist->next_dts == AV_NOPTS_VALUE)
+        ist->next_dts = ist->last_dts;
+
+    if (!pkt) {
+        /* EOF handling */
+        av_init_packet(&avpkt);
+        avpkt.data = NULL;
+        avpkt.size = 0;
+    } else {
+        avpkt = *pkt;
+    }
+
+    if (pkt && pkt->dts != AV_NOPTS_VALUE)
+        ist->next_dts = ist->last_dts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q);
+
+    // while we have more to decode or while the decoder did output something on EOF
+    while (ist->decoding_needed && (!pkt || avpkt.size > 0)) {
+        int ret = 0;
+        int got_output = 0;
+        int decode_failed = 0;
+
+        if (!repeating)
+            ist->last_dts = ist->next_dts;
+
+        switch (ist->dec_ctx->codec_type) {
+        case AVMEDIA_TYPE_AUDIO:
+            ret = decode_audio    (ist, repeating ? NULL : &avpkt, &got_output,
+                                   &decode_failed);
+            break;
+        case AVMEDIA_TYPE_VIDEO:
+            ret = decode_video    (ist, repeating ? NULL : &avpkt, &got_output,
+                                   &decode_failed);
+            if (repeating && !got_output)
+                ;
+            else if (pkt && pkt->duration)
+                ist->next_dts += av_rescale_q(pkt->duration, ist->st->time_base, AV_TIME_BASE_Q);
+            else if (ist->st->avg_frame_rate.num)
+                ist->next_dts += av_rescale_q(1, av_inv_q(ist->st->avg_frame_rate),
+                                              AV_TIME_BASE_Q);
+            else if (ist->dec_ctx->framerate.num != 0) {
+                int ticks      = ist->st->parser ? ist->st->parser->repeat_pict + 1 :
+                                                   ist->dec_ctx->ticks_per_frame;
+                ist->next_dts += av_rescale_q(ticks, ist->dec_ctx->framerate, AV_TIME_BASE_Q);
+            }
+            break;
+        case AVMEDIA_TYPE_SUBTITLE:
+            if (repeating)
+                break;
+            ret = transcode_subtitles(ist, &avpkt, &got_output, &decode_failed);
+            break;
+        default:
+            return;
+        }
+
+        if (ret < 0) {
+            if (decode_failed) {
+                av_log(NULL, AV_LOG_ERROR, "Error while decoding stream #%d:%d\n",
+                       ist->file_index, ist->st->index);
+            } else {
+                av_log(NULL, AV_LOG_FATAL, "Error while processing the decoded "
+                       "data for stream #%d:%d\n", ist->file_index, ist->st->index);
+            }
+            if (!decode_failed || exit_on_error)
+                exit_program(1);
+            break;
+        }
+
+        if (!got_output)
+            break;
+
+        repeating = 1;
+    }
+
+    /* after flushing, send an EOF on all the filter inputs attached to the stream */
+    /* except when looping we need to flush but not to send an EOF */
+    if (!pkt && ist->decoding_needed && !no_eof) {
+        int ret = send_filter_eof(ist);
+        if (ret < 0) {
+            av_log(NULL, AV_LOG_FATAL, "Error marking filters as finished\n");
+            exit_program(1);
+        }
+    }
+
+    /* handle stream copy */
+    if (!ist->decoding_needed) {
+        ist->last_dts = ist->next_dts;
+        switch (ist->dec_ctx->codec_type) {
+        case AVMEDIA_TYPE_AUDIO:
+            ist->next_dts += ((int64_t)AV_TIME_BASE * ist->dec_ctx->frame_size) /
+                             ist->dec_ctx->sample_rate;
+            break;
+        case AVMEDIA_TYPE_VIDEO:
+            if (ist->dec_ctx->framerate.num != 0) {
+                int ticks = ist->st->parser ? ist->st->parser->repeat_pict + 1 : ist->dec_ctx->ticks_per_frame;
+                ist->next_dts += ((int64_t)AV_TIME_BASE *
+                                  ist->dec_ctx->framerate.den * ticks) /
+                                  ist->dec_ctx->framerate.num;
+            }
+            break;
+        }
+    }
+    for (i = 0; pkt && i < nb_output_streams; i++) {
+        OutputStream *ost = output_streams[i];
+
+        if (!check_output_constraints(ist, ost) || ost->encoding_needed)
+            continue;
+
+        do_streamcopy(ist, ost, pkt);
+    }
+
+    return;
+}
+
+static void print_sdp(void)
+{
+    char sdp[16384];
+    int i;
+    AVFormatContext **avc;
+
+    for (i = 0; i < nb_output_files; i++) {
+        if (!output_files[i]->header_written)
+            return;
+    }
+
+    avc = av_malloc(sizeof(*avc) * nb_output_files);
+    if (!avc)
+        exit_program(1);
+    for (i = 0; i < nb_output_files; i++)
+        avc[i] = output_files[i]->ctx;
+
+    av_sdp_create(avc, nb_output_files, sdp, sizeof(sdp));
+    printf("SDP:\n%s\n", sdp);
+    fflush(stdout);
+    av_freep(&avc);
+}
+
+static const HWAccel *get_hwaccel(enum AVPixelFormat pix_fmt)
+{
+    int i;
+    for (i = 0; hwaccels[i].name; i++)
+        if (hwaccels[i].pix_fmt == pix_fmt)
+            return &hwaccels[i];
+    return NULL;
+}
+
+static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)
+{
+    InputStream *ist = s->opaque;
+    const enum AVPixelFormat *p;
+    int ret;
+
+    for (p = pix_fmts; *p != -1; p++) {
+        const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p);
+        const HWAccel *hwaccel;
+
+        if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
+            break;
+
+        hwaccel = get_hwaccel(*p);
+        if (!hwaccel ||
+            (ist->active_hwaccel_id && ist->active_hwaccel_id != hwaccel->id) ||
+            (ist->hwaccel_id != HWACCEL_AUTO && ist->hwaccel_id != hwaccel->id))
+            continue;
+
+        ret = hwaccel->init(s);
+        if (ret < 0) {
+            if (ist->hwaccel_id == hwaccel->id) {
+                av_log(NULL, AV_LOG_FATAL,
+                       "%s hwaccel requested for input stream #%d:%d, "
+                       "but cannot be initialized.\n", hwaccel->name,
+                       ist->file_index, ist->st->index);
+                return AV_PIX_FMT_NONE;
+            }
+            continue;
+        }
+
+        if (ist->hw_frames_ctx) {
+            s->hw_frames_ctx = av_buffer_ref(ist->hw_frames_ctx);
+            if (!s->hw_frames_ctx)
+                return AV_PIX_FMT_NONE;
+        }
+
+        ist->active_hwaccel_id = hwaccel->id;
+        ist->hwaccel_pix_fmt   = *p;
+        break;
+    }
+
+    return *p;
+}
+
+static int get_buffer(AVCodecContext *s, AVFrame *frame, int flags)
+{
+    InputStream *ist = s->opaque;
+
+    if (ist->hwaccel_get_buffer && frame->format == ist->hwaccel_pix_fmt)
+        return ist->hwaccel_get_buffer(s, frame, flags);
+
+    return avcodec_default_get_buffer2(s, frame, flags);
+}
+
+static int init_input_stream(int ist_index, char *error, int error_len)
+{
+    int ret;
+    InputStream *ist = input_streams[ist_index];
+
+    if (ist->decoding_needed) {
+        AVCodec *codec = ist->dec;
+        if (!codec) {
+            snprintf(error, error_len, "Decoder (codec id %d) not found for input stream #%d:%d",
+                    ist->dec_ctx->codec_id, ist->file_index, ist->st->index);
+            return AVERROR(EINVAL);
+        }
+
+        ist->dec_ctx->opaque                = ist;
+        ist->dec_ctx->get_format            = get_format;
+        ist->dec_ctx->get_buffer2           = get_buffer;
+        ist->dec_ctx->thread_safe_callbacks = 1;
+
+        av_opt_set_int(ist->dec_ctx, "refcounted_frames", 1, 0);
+
+        if (!av_dict_get(ist->decoder_opts, "threads", NULL, 0))
+            av_dict_set(&ist->decoder_opts, "threads", "auto", 0);
+        if ((ret = avcodec_open2(ist->dec_ctx, codec, &ist->decoder_opts)) < 0) {
+            char errbuf[128];
+            if (ret == AVERROR_EXPERIMENTAL)
+                abort_codec_experimental(codec, 0);
+
+            av_strerror(ret, errbuf, sizeof(errbuf));
+
+            snprintf(error, error_len,
+                     "Error while opening decoder for input stream "
+                     "#%d:%d : %s",
+                     ist->file_index, ist->st->index, errbuf);
+            return ret;
+        }
+        assert_avoptions(ist->decoder_opts);
+    }
+
+    ist->last_dts = ist->st->avg_frame_rate.num ? - ist->dec_ctx->has_b_frames * AV_TIME_BASE / av_q2d(ist->st->avg_frame_rate) : 0;
+    ist->next_dts = AV_NOPTS_VALUE;
+    init_pts_correction(&ist->pts_ctx);
+
+    return 0;
+}
+
+static InputStream *get_input_stream(OutputStream *ost)
+{
+    if (ost->source_index >= 0)
+        return input_streams[ost->source_index];
+
+    if (ost->filter) {
+        FilterGraph *fg = ost->filter->graph;
+        int i;
+
+        for (i = 0; i < fg->nb_inputs; i++)
+            if (fg->inputs[i]->ist->dec_ctx->codec_type == ost->enc_ctx->codec_type)
+                return fg->inputs[i]->ist;
+    }
+
+    return NULL;
+}
+
+/* open the muxer when all the streams are initialized */
+static int check_init_output_file(OutputFile *of, int file_index)
+{
+    int ret, i;
+
+    for (i = 0; i < of->ctx->nb_streams; i++) {
+        OutputStream *ost = output_streams[of->ost_index + i];
+        if (!ost->initialized)
+            return 0;
+    }
+
+    of->ctx->interrupt_callback = int_cb;
+
+    ret = avformat_write_header(of->ctx, &of->opts);
+    if (ret < 0) {
+        char errbuf[128];
+
+        av_strerror(ret, errbuf, sizeof(errbuf));
+
+        av_log(NULL, AV_LOG_ERROR,
+               "Could not write header for output file #%d "
+               "(incorrect codec parameters ?): %s",
+               file_index, errbuf);
+        return ret;
+    }
+    assert_avoptions(of->opts);
+    of->header_written = 1;
+
+    av_dump_format(of->ctx, file_index, of->ctx->filename, 1);
+
+    if (want_sdp)
+        print_sdp();
+
+    /* flush the muxing queues */
+    for (i = 0; i < of->ctx->nb_streams; i++) {
+        OutputStream *ost = output_streams[of->ost_index + i];
+
+        while (av_fifo_size(ost->muxing_queue)) {
+            AVPacket pkt;
+            av_fifo_generic_read(ost->muxing_queue, &pkt, sizeof(pkt), NULL);
+            write_packet(of, &pkt, ost);
+        }
+    }
+
+    return 0;
+}
+
+static int init_output_bsfs(OutputStream *ost)
+{
+    AVBSFContext *ctx;
+    int i, ret;
+
+    if (!ost->nb_bitstream_filters)
+        return 0;
+
+    for (i = 0; i < ost->nb_bitstream_filters; i++) {
+        ctx = ost->bsf_ctx[i];
+
+        ret = avcodec_parameters_copy(ctx->par_in,
+                                      i ? ost->bsf_ctx[i - 1]->par_out : ost->st->codecpar);
+        if (ret < 0)
+            return ret;
+
+        ctx->time_base_in = i ? ost->bsf_ctx[i - 1]->time_base_out : ost->st->time_base;
+
+        ret = av_bsf_init(ctx);
+        if (ret < 0) {
+            av_log(NULL, AV_LOG_ERROR, "Error initializing bitstream filter: %s\n",
+                   ctx->filter->name);
+            return ret;
+        }
+    }
+
+    ret = avcodec_parameters_copy(ost->st->codecpar, ctx->par_out);
+    if (ret < 0)
+        return ret;
+
+    ost->st->time_base = ctx->time_base_out;
+
+    return 0;
+}
+
+static int init_output_stream_streamcopy(OutputStream *ost)
+{
+    OutputFile *of = output_files[ost->file_index];
+    InputStream *ist = get_input_stream(ost);
+    AVCodecParameters *par_dst = ost->st->codecpar;
+    AVCodecParameters *par_src = ist->st->codecpar;
+    AVRational sar;
+    uint32_t codec_tag = par_dst->codec_tag;
+    int i, ret;
+
+    if (!codec_tag) {
+        if (!of->ctx->oformat->codec_tag ||
+             av_codec_get_id (of->ctx->oformat->codec_tag, par_src->codec_tag) == par_src->codec_id ||
+             av_codec_get_tag(of->ctx->oformat->codec_tag, par_src->codec_id) <= 0)
+            codec_tag = par_src->codec_tag;
+    }
+
+    ret = avcodec_parameters_copy(par_dst, par_src);
+    if (ret < 0)
+        return ret;
+
+    par_dst->codec_tag = codec_tag;
+
+    ost->st->disposition = ist->st->disposition;
+
+    ost->st->time_base = ist->st->time_base;
+
+    if (ost->bitrate_override)
+        par_dst->bit_rate = ost->bitrate_override;
+
+    if (ist->st->nb_side_data) {
+        ost->st->side_data = av_realloc_array(NULL, ist->st->nb_side_data,
+                                              sizeof(*ist->st->side_data));
+        if (!ost->st->side_data)
+            return AVERROR(ENOMEM);
+
+        for (i = 0; i < ist->st->nb_side_data; i++) {
+            const AVPacketSideData *sd_src = &ist->st->side_data[i];
+            AVPacketSideData *sd_dst = &ost->st->side_data[i];
+
+            sd_dst->data = av_malloc(sd_src->size);
+            if (!sd_dst->data)
+                return AVERROR(ENOMEM);
+            memcpy(sd_dst->data, sd_src->data, sd_src->size);
+            sd_dst->size = sd_src->size;
+            sd_dst->type = sd_src->type;
+            ost->st->nb_side_data++;
+        }
+    }
+
+    ost->parser = av_parser_init(par_dst->codec_id);
+    ost->parser_avctx = avcodec_alloc_context3(NULL);
+    if (!ost->parser_avctx)
+        return AVERROR(ENOMEM);
+
+    if (par_dst->codec_type == AVMEDIA_TYPE_VIDEO) {
+        if (ost->frame_aspect_ratio)
+            sar = av_d2q(ost->frame_aspect_ratio * par_dst->height / par_dst->width, 255);
+        else if (ist->st->sample_aspect_ratio.num)
+            sar = ist->st->sample_aspect_ratio;
+        else
+            sar = par_src->sample_aspect_ratio;
+        ost->st->sample_aspect_ratio = par_dst->sample_aspect_ratio = sar;
+    }
+
+    return 0;
+}
+
+static void set_encoder_id(OutputFile *of, OutputStream *ost)
+{
+    AVDictionaryEntry *e;
+
+    uint8_t *encoder_string;
+    int encoder_string_len;
+    int format_flags = 0;
+
+    e = av_dict_get(of->opts, "fflags", NULL, 0);
+    if (e) {
+        const AVOption *o = av_opt_find(of->ctx, "fflags", NULL, 0, 0);
+        if (!o)
+            return;
+        av_opt_eval_flags(of->ctx, o, e->value, &format_flags);
+    }
+
+    encoder_string_len = sizeof(LIBAVCODEC_IDENT) + strlen(ost->enc->name) + 2;
+    encoder_string     = av_mallocz(encoder_string_len);
+    if (!encoder_string)
+        exit_program(1);
+
+    if (!(format_flags & AVFMT_FLAG_BITEXACT))
+        av_strlcpy(encoder_string, LIBAVCODEC_IDENT " ", encoder_string_len);
+    av_strlcat(encoder_string, ost->enc->name, encoder_string_len);
+    av_dict_set(&ost->st->metadata, "encoder",  encoder_string,
+                AV_DICT_DONT_STRDUP_VAL | AV_DICT_DONT_OVERWRITE);
+}
+
+static void parse_forced_key_frames(char *kf, OutputStream *ost,
+                                    AVCodecContext *avctx)
+{
+    char *p;
+    int n = 1, i;
+    int64_t t;
+
+    for (p = kf; *p; p++)
+        if (*p == ',')
+            n++;
+    ost->forced_kf_count = n;
+    ost->forced_kf_pts   = av_malloc(sizeof(*ost->forced_kf_pts) * n);
+    if (!ost->forced_kf_pts) {
+        av_log(NULL, AV_LOG_FATAL, "Could not allocate forced key frames array.\n");
+        exit_program(1);
+    }
+
+    p = kf;
+    for (i = 0; i < n; i++) {
+        char *next = strchr(p, ',');
+
+        if (next)
+            *next++ = 0;
+
+        t = parse_time_or_die("force_key_frames", p, 1);
+        ost->forced_kf_pts[i] = av_rescale_q(t, AV_TIME_BASE_Q, avctx->time_base);
+
+        p = next;
+    }
+}
+
+static int init_output_stream_encode(OutputStream *ost)
+{
+    InputStream *ist = get_input_stream(ost);
+    AVCodecContext *enc_ctx = ost->enc_ctx;
+    AVCodecContext *dec_ctx = NULL;
+
+    set_encoder_id(output_files[ost->file_index], ost);
+
+    if (ist) {
+        ost->st->disposition = ist->st->disposition;
+
+        dec_ctx = ist->dec_ctx;
+
+        enc_ctx->bits_per_raw_sample    = dec_ctx->bits_per_raw_sample;
+        enc_ctx->chroma_sample_location = dec_ctx->chroma_sample_location;
+    }
+
+    switch (enc_ctx->codec_type) {
+    case AVMEDIA_TYPE_AUDIO:
+        enc_ctx->sample_fmt     = ost->filter->filter->inputs[0]->format;
+        enc_ctx->sample_rate    = ost->filter->filter->inputs[0]->sample_rate;
+        enc_ctx->channel_layout = ost->filter->filter->inputs[0]->channel_layout;
+        enc_ctx->channels       = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
+        enc_ctx->time_base      = (AVRational){ 1, enc_ctx->sample_rate };
+        break;
+    case AVMEDIA_TYPE_VIDEO:
+        enc_ctx->time_base = ost->filter->filter->inputs[0]->time_base;
+
+        enc_ctx->width  = ost->filter->filter->inputs[0]->w;
+        enc_ctx->height = ost->filter->filter->inputs[0]->h;
+        enc_ctx->sample_aspect_ratio = ost->st->sample_aspect_ratio =
+            ost->frame_aspect_ratio ? // overridden by the -aspect cli option
+            av_d2q(ost->frame_aspect_ratio * enc_ctx->height/enc_ctx->width, 255) :
+            ost->filter->filter->inputs[0]->sample_aspect_ratio;
+        enc_ctx->pix_fmt = ost->filter->filter->inputs[0]->format;
+
+        enc_ctx->framerate = ost->frame_rate;
+
+        ost->st->avg_frame_rate = ost->frame_rate;
+
+        if (dec_ctx &&
+            (enc_ctx->width   != dec_ctx->width  ||
+             enc_ctx->height  != dec_ctx->height ||
+             enc_ctx->pix_fmt != dec_ctx->pix_fmt)) {
+            enc_ctx->bits_per_raw_sample = 0;
+        }
+
+        if (ost->forced_keyframes)
+            parse_forced_key_frames(ost->forced_keyframes, ost,
+                                    ost->enc_ctx);
+        break;
+    case AVMEDIA_TYPE_SUBTITLE:
+        enc_ctx->time_base = (AVRational){1, 1000};
+        break;
+    default:
+        abort();
+        break;
+    }
+
+    return 0;
+}
+
+static int init_output_stream(OutputStream *ost, char *error, int error_len)
+{
+    int ret = 0;
+
+    if (ost->encoding_needed) {
+        AVCodec      *codec = ost->enc;
+        AVCodecContext *dec = NULL;
+        InputStream *ist;
+
+        ret = init_output_stream_encode(ost);
+        if (ret < 0)
+            return ret;
+
+        if ((ist = get_input_stream(ost)))
+            dec = ist->dec_ctx;
+        if (dec && dec->subtitle_header) {
+            ost->enc_ctx->subtitle_header = av_malloc(dec->subtitle_header_size);
+            if (!ost->enc_ctx->subtitle_header)
+                return AVERROR(ENOMEM);
+            memcpy(ost->enc_ctx->subtitle_header, dec->subtitle_header, dec->subtitle_header_size);
+            ost->enc_ctx->subtitle_header_size = dec->subtitle_header_size;
+        }
+        if (!av_dict_get(ost->encoder_opts, "threads", NULL, 0))
+            av_dict_set(&ost->encoder_opts, "threads", "auto", 0);
+
+        if (ost->filter && ost->filter->filter->inputs[0]->hw_frames_ctx &&
+            ((AVHWFramesContext*)ost->filter->filter->inputs[0]->hw_frames_ctx->data)->format ==
+            ost->filter->filter->inputs[0]->format) {
+            ost->enc_ctx->hw_frames_ctx = av_buffer_ref(ost->filter->filter->inputs[0]->hw_frames_ctx);
+            if (!ost->enc_ctx->hw_frames_ctx)
+                return AVERROR(ENOMEM);
+        }
+
+        if ((ret = avcodec_open2(ost->enc_ctx, codec, &ost->encoder_opts)) < 0) {
+            if (ret == AVERROR_EXPERIMENTAL)
+                abort_codec_experimental(codec, 1);
+            snprintf(error, error_len,
+                     "Error while opening encoder for output stream #%d:%d - "
+                     "maybe incorrect parameters such as bit_rate, rate, width or height",
+                    ost->file_index, ost->index);
+            return ret;
+        }
+        assert_avoptions(ost->encoder_opts);
+        if (ost->enc_ctx->bit_rate && ost->enc_ctx->bit_rate < 1000)
+            av_log(NULL, AV_LOG_WARNING, "The bitrate parameter is set too low."
+                                         "It takes bits/s as argument, not kbits/s\n");
+
+        ret = avcodec_parameters_from_context(ost->st->codecpar, ost->enc_ctx);
+        if (ret < 0) {
+            av_log(NULL, AV_LOG_FATAL,
+                   "Error initializing the output stream codec context.\n");
+            exit_program(1);
+        }
+
+        if (ost->enc_ctx->nb_coded_side_data) {
+            int i;
+
+            ost->st->side_data = av_realloc_array(NULL, ost->enc_ctx->nb_coded_side_data,
+                                                  sizeof(*ost->st->side_data));
+            if (!ost->st->side_data)
+                return AVERROR(ENOMEM);
+
+            for (i = 0; i < ost->enc_ctx->nb_coded_side_data; i++) {
+                const AVPacketSideData *sd_src = &ost->enc_ctx->coded_side_data[i];
+                AVPacketSideData *sd_dst = &ost->st->side_data[i];
+
+                sd_dst->data = av_malloc(sd_src->size);
+                if (!sd_dst->data)
+                    return AVERROR(ENOMEM);
+                memcpy(sd_dst->data, sd_src->data, sd_src->size);
+                sd_dst->size = sd_src->size;
+                sd_dst->type = sd_src->type;
+                ost->st->nb_side_data++;
+            }
+        }
+
+        ost->st->time_base = ost->enc_ctx->time_base;
+    } else if (ost->stream_copy) {
+        ret = init_output_stream_streamcopy(ost);
+        if (ret < 0)
+            return ret;
+
+        /*
+         * FIXME: will the codec context used by the parser during streamcopy
+         * This should go away with the new parser API.
+         */
+        ret = avcodec_parameters_to_context(ost->parser_avctx, ost->st->codecpar);
+        if (ret < 0)
+            return ret;
+    }
+
+    /* initialize bitstream filters for the output stream
+     * needs to be done here, because the codec id for streamcopy is not
+     * known until now */
+    ret = init_output_bsfs(ost);
+    if (ret < 0)
+        return ret;
+
+    ost->mux_timebase = ost->st->time_base;
+
+    ost->initialized = 1;
+
+    ret = check_init_output_file(output_files[ost->file_index], ost->file_index);
+    if (ret < 0)
+        return ret;
+
+    return ret;
+}
+
+static int transcode_init(void)
+{
+    int ret = 0, i, j, k;
+    OutputStream *ost;
+    InputStream *ist;
+    char error[1024];
+
+    /* init framerate emulation */
+    for (i = 0; i < nb_input_files; i++) {
+        InputFile *ifile = input_files[i];
+        if (ifile->rate_emu)
+            for (j = 0; j < ifile->nb_streams; j++)
+                input_streams[j + ifile->ist_index]->start = av_gettime_relative();
+    }
+
+    /* init input streams */
+    for (i = 0; i < nb_input_streams; i++)
+        if ((ret = init_input_stream(i, error, sizeof(error))) < 0)
+            goto dump_format;
+
+    /* open each encoder */
+    for (i = 0; i < nb_output_streams; i++) {
+        // skip streams fed from filtergraphs until we have a frame for them
+        if (output_streams[i]->filter)
+            continue;
+
+        ret = init_output_stream(output_streams[i], error, sizeof(error));
+        if (ret < 0)
+            goto dump_format;
+    }
+
+
+    /* discard unused programs */
+    for (i = 0; i < nb_input_files; i++) {
+        InputFile *ifile = input_files[i];
+        for (j = 0; j < ifile->ctx->nb_programs; j++) {
+            AVProgram *p = ifile->ctx->programs[j];
+            int discard  = AVDISCARD_ALL;
+
+            for (k = 0; k < p->nb_stream_indexes; k++)
+                if (!input_streams[ifile->ist_index + p->stream_index[k]]->discard) {
+                    discard = AVDISCARD_DEFAULT;
+                    break;
+                }
+            p->discard = discard;
+        }
+    }
+
+ dump_format:
+    /* dump the stream mapping */
+    av_log(NULL, AV_LOG_INFO, "Stream mapping:\n");
+    for (i = 0; i < nb_input_streams; i++) {
+        ist = input_streams[i];
+
+        for (j = 0; j < ist->nb_filters; j++) {
+            if (!filtergraph_is_simple(ist->filters[j]->graph)) {
+                av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d (%s) -> %s",
+                       ist->file_index, ist->st->index, ist->dec ? ist->dec->name : "?",
+                       ist->filters[j]->name);
+                if (nb_filtergraphs > 1)
+                    av_log(NULL, AV_LOG_INFO, " (graph %d)", ist->filters[j]->graph->index);
+                av_log(NULL, AV_LOG_INFO, "\n");
+            }
+        }
+    }
+
+    for (i = 0; i < nb_output_streams; i++) {
+        ost = output_streams[i];
+
+        if (ost->attachment_filename) {
+            /* an attached file */
+            av_log(NULL, AV_LOG_INFO, "  File %s -> Stream #%d:%d\n",
+                   ost->attachment_filename, ost->file_index, ost->index);
+            continue;
+        }
+
+        if (ost->filter && !filtergraph_is_simple(ost->filter->graph)) {
+            /* output from a complex graph */
+            av_log(NULL, AV_LOG_INFO, "  %s", ost->filter->name);
+            if (nb_filtergraphs > 1)
+                av_log(NULL, AV_LOG_INFO, " (graph %d)", ost->filter->graph->index);
+
+            av_log(NULL, AV_LOG_INFO, " -> Stream #%d:%d (%s)\n", ost->file_index,
+                   ost->index, ost->enc ? ost->enc->name : "?");
+            continue;
+        }
+
+        av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d -> #%d:%d",
+               input_streams[ost->source_index]->file_index,
+               input_streams[ost->source_index]->st->index,
+               ost->file_index,
+               ost->index);
+        if (ost->sync_ist != input_streams[ost->source_index])
+            av_log(NULL, AV_LOG_INFO, " [sync #%d:%d]",
+                   ost->sync_ist->file_index,
+                   ost->sync_ist->st->index);
+        if (ost->stream_copy)
+            av_log(NULL, AV_LOG_INFO, " (copy)");
+        else {
+            const AVCodec *in_codec    = input_streams[ost->source_index]->dec;
+            const AVCodec *out_codec   = ost->enc;
+            const char *decoder_name   = "?";
+            const char *in_codec_name  = "?";
+            const char *encoder_name   = "?";
+            const char *out_codec_name = "?";
+            const AVCodecDescriptor *desc;
+
+            if (in_codec) {
+                decoder_name  = in_codec->name;
+                desc = avcodec_descriptor_get(in_codec->id);
+                if (desc)
+                    in_codec_name = desc->name;
+                if (!strcmp(decoder_name, in_codec_name))
+                    decoder_name = "native";
+            }
+
+            if (out_codec) {
+                encoder_name   = out_codec->name;
+                desc = avcodec_descriptor_get(out_codec->id);
+                if (desc)
+                    out_codec_name = desc->name;
+                if (!strcmp(encoder_name, out_codec_name))
+                    encoder_name = "native";
+            }
+
+            av_log(NULL, AV_LOG_INFO, " (%s (%s) -> %s (%s))",
+                   in_codec_name, decoder_name,
+                   out_codec_name, encoder_name);
+        }
+        av_log(NULL, AV_LOG_INFO, "\n");
+    }
+
+    if (ret) {
+        av_log(NULL, AV_LOG_ERROR, "%s\n", error);
+        return ret;
+    }
+
+    return 0;
+}
+
+/* Return 1 if there remain streams where more output is wanted, 0 otherwise. */
+static int need_output(void)
+{
+    int i;
+
+    for (i = 0; i < nb_output_streams; i++) {
+        OutputStream *ost    = output_streams[i];
+        OutputFile *of       = output_files[ost->file_index];
+        AVFormatContext *os  = output_files[ost->file_index]->ctx;
+
+        if (ost->finished ||
+            (os->pb && avio_tell(os->pb) >= of->limit_filesize))
+            continue;
+        if (ost->frame_number >= ost->max_frames) {
+            int j;
+            for (j = 0; j < of->ctx->nb_streams; j++)
+                output_streams[of->ost_index + j]->finished = 1;
+            continue;
+        }
+
+        return 1;
+    }
+
+    return 0;
+}
+
+static InputFile *select_input_file(void)
+{
+    InputFile *ifile = NULL;
+    int64_t ipts_min = INT64_MAX;
+    int i;
+
+    for (i = 0; i < nb_input_streams; i++) {
+        InputStream *ist = input_streams[i];
+        int64_t ipts     = ist->last_dts;
+
+        if (ist->discard || input_files[ist->file_index]->eagain)
+            continue;
+        if (!input_files[ist->file_index]->eof_reached) {
+            if (ipts < ipts_min) {
+                ipts_min = ipts;
+                ifile    = input_files[ist->file_index];
+            }
+        }
+    }
+
+    return ifile;
+}
+
+#if HAVE_PTHREADS
+static void *input_thread(void *arg)
+{
+    InputFile *f = arg;
+    int ret = 0;
+
+    while (!transcoding_finished && ret >= 0) {
+        AVPacket pkt;
+        ret = av_read_frame(f->ctx, &pkt);
+
+        if (ret == AVERROR(EAGAIN)) {
+            av_usleep(10000);
+            ret = 0;
+            continue;
+        } else if (ret < 0)
+            break;
+
+        pthread_mutex_lock(&f->fifo_lock);
+        while (!av_fifo_space(f->fifo))
+            pthread_cond_wait(&f->fifo_cond, &f->fifo_lock);
+
+        av_fifo_generic_write(f->fifo, &pkt, sizeof(pkt), NULL);
+
+        pthread_mutex_unlock(&f->fifo_lock);
+    }
+
+    f->finished = 1;
+    return NULL;
+}
+
+static void free_input_threads(void)
+{
+    int i;
+
+    if (nb_input_files == 1)
+        return;
+
+    transcoding_finished = 1;
+
+    for (i = 0; i < nb_input_files; i++) {
+        InputFile *f = input_files[i];
+        AVPacket pkt;
+
+        if (!f->fifo || f->joined)
+            continue;
+
+        pthread_mutex_lock(&f->fifo_lock);
+        while (av_fifo_size(f->fifo)) {
+            av_fifo_generic_read(f->fifo, &pkt, sizeof(pkt), NULL);
+            av_packet_unref(&pkt);
+        }
+        pthread_cond_signal(&f->fifo_cond);
+        pthread_mutex_unlock(&f->fifo_lock);
+
+        pthread_join(f->thread, NULL);
+        f->joined = 1;
+
+        while (av_fifo_size(f->fifo)) {
+            av_fifo_generic_read(f->fifo, &pkt, sizeof(pkt), NULL);
+            av_packet_unref(&pkt);
+        }
+        av_fifo_free(f->fifo);
+    }
+}
+
+static int init_input_threads(void)
+{
+    int i, ret;
+
+    if (nb_input_files == 1)
+        return 0;
+
+    for (i = 0; i < nb_input_files; i++) {
+        InputFile *f = input_files[i];
+
+        if (!(f->fifo = av_fifo_alloc(8*sizeof(AVPacket))))
+            return AVERROR(ENOMEM);
+
+        pthread_mutex_init(&f->fifo_lock, NULL);
+        pthread_cond_init (&f->fifo_cond, NULL);
+
+        if ((ret = pthread_create(&f->thread, NULL, input_thread, f)))
+            return AVERROR(ret);
+    }
+    return 0;
+}
+
+static int get_input_packet_mt(InputFile *f, AVPacket *pkt)
+{
+    int ret = 0;
+
+    pthread_mutex_lock(&f->fifo_lock);
+
+    if (av_fifo_size(f->fifo)) {
+        av_fifo_generic_read(f->fifo, pkt, sizeof(*pkt), NULL);
+        pthread_cond_signal(&f->fifo_cond);
+    } else {
+        if (f->finished)
+            ret = AVERROR_EOF;
+        else
+            ret = AVERROR(EAGAIN);
+    }
+
+    pthread_mutex_unlock(&f->fifo_lock);
+
+    return ret;
+}
+#endif
+
+static int get_input_packet(InputFile *f, AVPacket *pkt)
+{
+    if (f->rate_emu) {
+        int i;
+        for (i = 0; i < f->nb_streams; i++) {
+            InputStream *ist = input_streams[f->ist_index + i];
+            int64_t pts = av_rescale(ist->last_dts, 1000000, AV_TIME_BASE);
+            int64_t now = av_gettime_relative() - ist->start;
+            if (pts > now)
+                return AVERROR(EAGAIN);
+        }
+    }
+
+#if HAVE_PTHREADS
+    if (nb_input_files > 1)
+        return get_input_packet_mt(f, pkt);
+#endif
+    return av_read_frame(f->ctx, pkt);
+}
+
+static int got_eagain(void)
+{
+    int i;
+    for (i = 0; i < nb_input_files; i++)
+        if (input_files[i]->eagain)
+            return 1;
+    return 0;
+}
+
+static void reset_eagain(void)
+{
+    int i;
+    for (i = 0; i < nb_input_files; i++)
+        input_files[i]->eagain = 0;
+}
+
+// set duration to max(tmp, duration) in a proper time base and return duration's time_base
+static AVRational duration_max(int64_t tmp, int64_t *duration, AVRational tmp_time_base,
+                                AVRational time_base)
+{
+    int ret;
+
+    if (!*duration) {
+        *duration = tmp;
+        return tmp_time_base;
+    }
+
+    ret = av_compare_ts(*duration, time_base, tmp, tmp_time_base);
+    if (ret < 0) {
+        *duration = tmp;
+        return tmp_time_base;
+    }
+
+    return time_base;
+}
+
+static int seek_to_start(InputFile *ifile, AVFormatContext *is)
+{
+    InputStream *ist;
+    AVCodecContext *avctx;
+    int i, ret, has_audio = 0;
+    int64_t duration = 0;
+
+    ret = av_seek_frame(is, -1, is->start_time, 0);
+    if (ret < 0)
+        return ret;
+
+    for (i = 0; i < ifile->nb_streams; i++) {
+        ist   = input_streams[ifile->ist_index + i];
+        avctx = ist->dec_ctx;
+
+        // flush decoders
+        if (ist->decoding_needed) {
+            process_input_packet(ist, NULL, 1);
+            avcodec_flush_buffers(avctx);
+        }
+
+        /* duration is the length of the last frame in a stream
+         * when audio stream is present we don't care about
+         * last video frame length because it's not defined exactly */
+        if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && ist->nb_samples)
+            has_audio = 1;
+    }
+
+    for (i = 0; i < ifile->nb_streams; i++) {
+        ist   = input_streams[ifile->ist_index + i];
+        avctx = ist->dec_ctx;
+
+        if (has_audio) {
+            if (avctx->codec_type == AVMEDIA_TYPE_AUDIO && ist->nb_samples) {
+                AVRational sample_rate = {1, avctx->sample_rate};
+
+                duration = av_rescale_q(ist->nb_samples, sample_rate, ist->st->time_base);
+            } else
+                continue;
+        } else {
+            if (ist->framerate.num) {
+                duration = av_rescale_q(1, ist->framerate, ist->st->time_base);
+            } else if (ist->st->avg_frame_rate.num) {
+                duration = av_rescale_q(1, ist->st->avg_frame_rate, ist->st->time_base);
+            } else duration = 1;
+        }
+        if (!ifile->duration)
+            ifile->time_base = ist->st->time_base;
+        /* the total duration of the stream, max_pts - min_pts is
+         * the duration of the stream without the last frame */
+        duration += ist->max_pts - ist->min_pts;
+        ifile->time_base = duration_max(duration, &ifile->duration, ist->st->time_base,
+                                        ifile->time_base);
+    }
+
+    if (ifile->loop > 0)
+        ifile->loop--;
+
+    return ret;
+}
+
+/*
+ * Read one packet from an input file and send it for
+ * - decoding -> lavfi (audio/video)
+ * - decoding -> encoding -> muxing (subtitles)
+ * - muxing (streamcopy)
+ *
+ * Return
+ * - 0 -- one packet was read and processed
+ * - AVERROR(EAGAIN) -- no packets were available for selected file,
+ *   this function should be called again
+ * - AVERROR_EOF -- this function should not be called again
+ */
+static int process_input(void)
+{
+    InputFile *ifile;
+    AVFormatContext *is;
+    InputStream *ist;
+    AVPacket pkt;
+    int ret, i, j;
+    int64_t duration;
+
+    /* select the stream that we must read now */
+    ifile = select_input_file();
+    /* if none, if is finished */
+    if (!ifile) {
+        if (got_eagain()) {
+            reset_eagain();
+            av_usleep(10000);
+            return AVERROR(EAGAIN);
+        }
+        av_log(NULL, AV_LOG_VERBOSE, "No more inputs to read from.\n");
+        return AVERROR_EOF;
+    }
+
+    is  = ifile->ctx;
+    ret = get_input_packet(ifile, &pkt);
+
+    if (ret == AVERROR(EAGAIN)) {
+        ifile->eagain = 1;
+        return ret;
+    }
+    if (ret < 0 && ifile->loop) {
+        if ((ret = seek_to_start(ifile, is)) < 0)
+            return ret;
+        ret = get_input_packet(ifile, &pkt);
+    }
+    if (ret < 0) {
+        if (ret != AVERROR_EOF) {
+            print_error(is->filename, ret);
+            if (exit_on_error)
+                exit_program(1);
+        }
+        ifile->eof_reached = 1;
+
+        for (i = 0; i < ifile->nb_streams; i++) {
+            ist = input_streams[ifile->ist_index + i];
+            if (ist->decoding_needed)
+                process_input_packet(ist, NULL, 0);
+
+            /* mark all outputs that don't go through lavfi as finished */
+            for (j = 0; j < nb_output_streams; j++) {
+                OutputStream *ost = output_streams[j];
+
+                if (ost->source_index == ifile->ist_index + i &&
+                    (ost->stream_copy || ost->enc->type == AVMEDIA_TYPE_SUBTITLE))
+                    finish_output_stream(ost);
+            }
+        }
+
+        return AVERROR(EAGAIN);
+    }
+
+    reset_eagain();
+
+    if (do_pkt_dump) {
+        av_pkt_dump_log2(NULL, AV_LOG_DEBUG, &pkt, do_hex_dump,
+                         is->streams[pkt.stream_index]);
+    }
+    /* the following test is needed in case new streams appear
+       dynamically in stream : we ignore them */
+    if (pkt.stream_index >= ifile->nb_streams)
+        goto discard_packet;
+
+    ist = input_streams[ifile->ist_index + pkt.stream_index];
+
+    ist->data_size += pkt.size;
+    ist->nb_packets++;
+
+    if (ist->discard)
+        goto discard_packet;
+
+    /* add the stream-global side data to the first packet */
+    if (ist->nb_packets == 1)
+        for (i = 0; i < ist->st->nb_side_data; i++) {
+            AVPacketSideData *src_sd = &ist->st->side_data[i];
+            uint8_t *dst_data;
+
+            if (av_packet_get_side_data(&pkt, src_sd->type, NULL))
+                continue;
+            if (ist->autorotate && src_sd->type == AV_PKT_DATA_DISPLAYMATRIX)
+                continue;
+
+            dst_data = av_packet_new_side_data(&pkt, src_sd->type, src_sd->size);
+            if (!dst_data)
+                exit_program(1);
+
+            memcpy(dst_data, src_sd->data, src_sd->size);
+        }
+
+    if (pkt.dts != AV_NOPTS_VALUE)
+        pkt.dts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
+    if (pkt.pts != AV_NOPTS_VALUE)
+        pkt.pts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
+
+    if (pkt.pts != AV_NOPTS_VALUE)
+        pkt.pts *= ist->ts_scale;
+    if (pkt.dts != AV_NOPTS_VALUE)
+        pkt.dts *= ist->ts_scale;
+
+    if ((ist->dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO ||
+         ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) &&
+        pkt.dts != AV_NOPTS_VALUE && ist->next_dts != AV_NOPTS_VALUE &&
+        (is->iformat->flags & AVFMT_TS_DISCONT)) {
+        int64_t pkt_dts = av_rescale_q(pkt.dts, ist->st->time_base, AV_TIME_BASE_Q);
+        int64_t delta   = pkt_dts - ist->next_dts;
+
+        if ((FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE || pkt_dts + 1 < ist->last_dts) && !copy_ts) {
+            ifile->ts_offset -= delta;
+            av_log(NULL, AV_LOG_DEBUG,
+                   "timestamp discontinuity %"PRId64", new offset= %"PRId64"\n",
+                   delta, ifile->ts_offset);
+            pkt.dts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
+            if (pkt.pts != AV_NOPTS_VALUE)
+                pkt.pts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
+        }
+    }
+    duration = av_rescale_q(ifile->duration, ifile->time_base, ist->st->time_base);
+    if (pkt.pts != AV_NOPTS_VALUE) {
+        pkt.pts += duration;
+        ist->max_pts = FFMAX(pkt.pts, ist->max_pts);
+        ist->min_pts = FFMIN(pkt.pts, ist->min_pts);
+    }
+
+    if (pkt.dts != AV_NOPTS_VALUE)
+        pkt.dts += duration;
+
+    process_input_packet(ist, &pkt, 0);
+
+discard_packet:
+    av_packet_unref(&pkt);
+
+    return 0;
+}
+
+/*
+ * The following code is the main loop of the file converter
+ */
+static int transcode(void)
+{
+    int ret, i, need_input = 1;
+    AVFormatContext *os;
+    OutputStream *ost;
+    InputStream *ist;
+    int64_t timer_start;
+
+    ret = transcode_init();
+    if (ret < 0)
+        goto fail;
+
+    av_log(NULL, AV_LOG_INFO, "Press ctrl-c to stop encoding\n");
+    term_init();
+
+    timer_start = av_gettime_relative();
+
+#if HAVE_PTHREADS
+    if ((ret = init_input_threads()) < 0)
+        goto fail;
+#endif
+
+    while (!received_sigterm) {
+        /* check if there's any stream where output is still needed */
+        if (!need_output()) {
+            av_log(NULL, AV_LOG_VERBOSE, "No more output streams to write to, finishing.\n");
+            break;
+        }
+
+        /* read and process one input packet if needed */
+        if (need_input) {
+            ret = process_input();
+            if (ret == AVERROR_EOF)
+                need_input = 0;
+        }
+
+        ret = poll_filters();
+        if (ret < 0 && ret != AVERROR_EOF) {
+            char errbuf[128];
+            av_strerror(ret, errbuf, sizeof(errbuf));
+
+            av_log(NULL, AV_LOG_ERROR, "Error while filtering: %s\n", errbuf);
+            break;
+        }
+
+        /* dump report by using the output first video and audio streams */
+        print_report(0, timer_start);
+    }
+#if HAVE_PTHREADS
+    free_input_threads();
+#endif
+
+    /* at the end of stream, we must flush the decoder buffers */
+    for (i = 0; i < nb_input_streams; i++) {
+        ist = input_streams[i];
+        if (!input_files[ist->file_index]->eof_reached && ist->decoding_needed) {
+            process_input_packet(ist, NULL, 0);
+        }
+    }
+    poll_filters();
+    flush_encoders();
+
+    term_exit();
+
+    /* write the trailer if needed and close file */
+    for (i = 0; i < nb_output_files; i++) {
+        os = output_files[i]->ctx;
+        if (!output_files[i]->header_written) {
+            av_log(NULL, AV_LOG_ERROR,
+                   "Nothing was written into output file %d (%s), because "
+                   "at least one of its streams received no packets.\n",
+                   i, os->filename);
+            continue;
+        }
+        av_write_trailer(os);
+    }
+
+    /* dump report by using the first video and audio streams */
+    print_report(1, timer_start);
+
+    /* close each encoder */
+    for (i = 0; i < nb_output_streams; i++) {
+        ost = output_streams[i];
+        if (ost->encoding_needed) {
+            av_freep(&ost->enc_ctx->stats_in);
+        }
+    }
+
+    /* close each decoder */
+    for (i = 0; i < nb_input_streams; i++) {
+        ist = input_streams[i];
+        if (ist->decoding_needed) {
+            avcodec_close(ist->dec_ctx);
+            if (ist->hwaccel_uninit)
+                ist->hwaccel_uninit(ist->dec_ctx);
+        }
+    }
+
+    av_buffer_unref(&hw_device_ctx);
+
+    /* finished ! */
+    ret = 0;
+
+ fail:
+#if HAVE_PTHREADS
+    free_input_threads();
+#endif
+
+    if (output_streams) {
+        for (i = 0; i < nb_output_streams; i++) {
+            ost = output_streams[i];
+            if (ost) {
+                if (ost->logfile) {
+                    fclose(ost->logfile);
+                    ost->logfile = NULL;
+                }
+                av_free(ost->forced_kf_pts);
+                av_dict_free(&ost->encoder_opts);
+                av_dict_free(&ost->resample_opts);
+            }
+        }
+    }
+    return ret;
+}
+
+static int64_t getutime(void)
+{
+#if HAVE_GETRUSAGE
+    struct rusage rusage;
+
+    getrusage(RUSAGE_SELF, &rusage);
+    return (rusage.ru_utime.tv_sec * 1000000LL) + rusage.ru_utime.tv_usec;
+#elif HAVE_GETPROCESSTIMES
+    HANDLE proc;
+    FILETIME c, e, k, u;
+    proc = GetCurrentProcess();
+    GetProcessTimes(proc, &c, &e, &k, &u);
+    return ((int64_t) u.dwHighDateTime << 32 | u.dwLowDateTime) / 10;
+#else
+    return av_gettime_relative();
+#endif
+}
+
+static int64_t getmaxrss(void)
+{
+#if HAVE_GETRUSAGE && HAVE_STRUCT_RUSAGE_RU_MAXRSS
+    struct rusage rusage;
+    getrusage(RUSAGE_SELF, &rusage);
+    return (int64_t)rusage.ru_maxrss * 1024;
+#elif HAVE_GETPROCESSMEMORYINFO
+    HANDLE proc;
+    PROCESS_MEMORY_COUNTERS memcounters;
+    proc = GetCurrentProcess();
+    memcounters.cb = sizeof(memcounters);
+    GetProcessMemoryInfo(proc, &memcounters, sizeof(memcounters));
+    return memcounters.PeakPagefileUsage;
+#else
+    return 0;
+#endif
+}
+
+int main(int argc, char **argv)
+{
+    int i, ret;
+    int64_t ti;
+
+    register_exit(avconv_cleanup);
+
+    av_log_set_flags(AV_LOG_SKIP_REPEATED);
+    parse_loglevel(argc, argv, options);
+
+    avcodec_register_all();
+#if CONFIG_AVDEVICE
+    avdevice_register_all();
+#endif
+    avfilter_register_all();
+    av_register_all();
+    avformat_network_init();
+
+    show_banner();
+
+    /* parse options and open all input/output files */
+    ret = avconv_parse_options(argc, argv);
+    if (ret < 0)
+        exit_program(1);
+
+    if (nb_output_files <= 0 && nb_input_files == 0) {
+        show_usage();
+        av_log(NULL, AV_LOG_WARNING, "Use -h to get full help or, even better, run 'man %s'\n", program_name);
+        exit_program(1);
+    }
+
+    /* file converter / grab */
+    if (nb_output_files <= 0) {
+        fprintf(stderr, "At least one output file must be specified\n");
+        exit_program(1);
+    }
+
+    for (i = 0; i < nb_output_files; i++) {
+        if (strcmp(output_files[i]->ctx->oformat->name, "rtp"))
+            want_sdp = 0;
+    }
+
+    ti = getutime();
+    if (transcode() < 0)
+        exit_program(1);
+    ti = getutime() - ti;
+    if (do_benchmark) {
+        int maxrss = getmaxrss() / 1024;
+        printf("bench: utime=%0.3fs maxrss=%ikB\n", ti / 1000000.0, maxrss);
+    }
+
+    exit_program(0);
+    return 0;
+}