avformat/hlsenc: creation of hls variant streams in a single hlsenc instance

Reviewed-by: Steven Liu <lingjiujianke@gmail.com>

1 files changed, 621 insertions, 306 deletions

diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index e0cef8b879..1515b3f359 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -1,6 +1,7 @@
 /*
  * Apple HTTP Live Streaming segmenter
  * Copyright (c) 2012, Luca Barbato
+ * Copyright (c) 2017 Akamai Technologies, Inc.
  *
  * This file is part of FFmpeg.
  *
@@ -56,6 +57,7 @@ typedef enum {
 #define KEYSIZE 16
 #define LINE_BUFFER_SIZE 1024
 #define HLS_MICROSECOND_UNIT   1000000
+#define POSTFIX_PATTERN "_%d"
 
 typedef struct HLSSegment {
     char filename[1024];
@@ -100,12 +102,9 @@ typedef enum {
     PLAYLIST_TYPE_NB,
 } PlaylistType;
 
-typedef struct HLSContext {
-    const AVClass *class;  // Class for private options.
+typedef struct VariantStream {
     unsigned number;
     int64_t sequence;
-    int64_t start_sequence;
-    uint32_t start_sequence_source_type;  // enum StartSequenceSourceType
     AVOutputFormat *oformat;
     AVOutputFormat *vtt_oformat;
     AVIOContext *out;
@@ -115,23 +114,6 @@ typedef struct HLSContext {
     AVFormatContext *avf;
     AVFormatContext *vtt_avf;
 
-    float time;            // Set by a private option.
-    float init_time;       // Set by a private option.
-    int max_nb_segments;   // Set by a private option.
-#if FF_API_HLS_WRAP
-    int  wrap;             // Set by a private option.
-#endif
-    uint32_t flags;        // enum HLSFlags
-    uint32_t pl_type;      // enum PlaylistType
-    char *segment_filename;
-    char *fmp4_init_filename;
-    int segment_type;
-    int fmp4_init_mode;
-
-    int use_localtime;      ///< flag to expand filename with localtime
-    int use_localtime_mkdir;///< flag to mkdir dirname in timebased filename
-    int allowcache;
-    int64_t recording_time;
     int has_video;
     int has_subtitle;
     int new_start;
@@ -141,7 +123,6 @@ typedef struct HLSContext {
     double duration;      // last segment duration computed so far, in seconds
     int64_t start_pos;    // last segment starting position
     int64_t size;         // last segment size
-    int64_t max_seg_size; // every segment file max size
     int nb_entries;
     int discontinuity_set;
     int discontinuity;
@@ -151,9 +132,45 @@ typedef struct HLSContext {
     HLSSegment *old_segments;
 
     char *basename;
-    char *base_output_dirname;
     char *vtt_basename;
     char *vtt_m3u8_name;
+    char *m3u8_name;
+
+    double initial_prog_date_time;
+    char current_segment_final_filename_fmt[1024]; // when renaming segments
+
+    char *fmp4_init_filename;
+    char *base_output_dirname;
+    int fmp4_init_mode;
+
+    AVStream **streams;
+    unsigned int nb_streams;
+    char *baseurl;
+} VariantStream;
+
+typedef struct HLSContext {
+    const AVClass *class;  // Class for private options.
+    int64_t start_sequence;
+    uint32_t start_sequence_source_type;  // enum StartSequenceSourceType
+
+    float time;            // Set by a private option.
+    float init_time;       // Set by a private option.
+    int max_nb_segments;   // Set by a private option.
+#if FF_API_HLS_WRAP
+    int  wrap;             // Set by a private option.
+#endif
+    uint32_t flags;        // enum HLSFlags
+    uint32_t pl_type;      // enum PlaylistType
+    char *segment_filename;
+    char *fmp4_init_filename;
+    int segment_type;
+
+    int use_localtime;      ///< flag to expand filename with localtime
+    int use_localtime_mkdir;///< flag to mkdir dirname in timebased filename
+    int allowcache;
+    int64_t recording_time;
+    int64_t max_seg_size; // every segment file max size
+
     char *baseurl;
     char *format_options_str;
     char *vtt_format_options_str;
@@ -165,6 +182,7 @@ typedef struct HLSContext {
     char *key_url;
     char *iv;
     char *key_basename;
+    int encrypt_started;
 
     char *key_info_file;
     char key_file[LINE_BUFFER_SIZE + 1];
@@ -174,10 +192,11 @@ typedef struct HLSContext {
     AVDictionary *vtt_format_options;
 
     char *method;
-
-    double initial_prog_date_time;
-    char current_segment_final_filename_fmt[1024]; // when renaming segments
     char *user_agent;
+
+    VariantStream *var_streams;
+    unsigned int nb_varstreams;
+    char *var_stream_map; /* user specified variant stream map string */
 } HLSContext;
 
 static int get_int_from_double(double val)
@@ -296,7 +315,8 @@ static void write_styp(AVIOContext *pb)
     ffio_wfourcc(pb, "msix");
 }
 
-static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls) {
+static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls,
+                                   VariantStream *vs) {
 
     HLSSegment *segment, *previous_segment = NULL;
     float playlist_duration = 0.0f;
@@ -307,13 +327,13 @@ static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls) {
     AVIOContext *out = NULL;
     const char *proto = NULL;
 
-    segment = hls->segments;
+    segment = vs->segments;
     while (segment) {
         playlist_duration += segment->duration;
         segment = segment->next;
     }
 
-    segment = hls->old_segments;
+    segment = vs->old_segments;
     while (segment) {
         playlist_duration -= segment->duration;
         previous_segment = segment;
@@ -328,7 +348,7 @@ static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls) {
         if (hls->segment_filename) {
             dirname = av_strdup(hls->segment_filename);
         } else {
-            dirname = av_strdup(hls->avf->filename);
+            dirname = av_strdup(vs->avf->filename);
         }
         if (!dirname) {
             ret = AVERROR(ENOMEM);
@@ -358,9 +378,9 @@ static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls) {
         proto = avio_find_protocol_name(s->filename);
         if (hls->method || (proto && !av_strcasecmp(proto, "http"))) {
             av_dict_set(&options, "method", "DELETE", 0);
-            if ((ret = hls->avf->io_open(hls->avf, &out, path, AVIO_FLAG_WRITE, &options)) < 0)
+            if ((ret = vs->avf->io_open(vs->avf, &out, path, AVIO_FLAG_WRITE, &options)) < 0)
                 goto fail;
-            ff_format_io_close(hls->avf, &out);
+            ff_format_io_close(vs->avf, &out);
         } else if (unlink(path) < 0) {
             av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
                                      path, strerror(errno));
@@ -379,11 +399,11 @@ static int hls_delete_old_segments(AVFormatContext *s, HLSContext *hls) {
 
             if (hls->method || (proto && !av_strcasecmp(proto, "http"))) {
                 av_dict_set(&options, "method", "DELETE", 0);
-                if ((ret = hls->avf->io_open(hls->avf, &out, sub_path, AVIO_FLAG_WRITE, &options)) < 0) {
+                if ((ret = vs->avf->io_open(vs->avf, &out, sub_path, AVIO_FLAG_WRITE, &options)) < 0) {
                     av_free(sub_path);
                     goto fail;
                 }
-                ff_format_io_close(hls->avf, &out);
+                ff_format_io_close(vs->avf, &out);
             } else if (unlink(sub_path) < 0) {
                 av_log(hls, AV_LOG_ERROR, "failed to delete old segment %s: %s\n",
                                          sub_path, strerror(errno));
@@ -417,7 +437,7 @@ static int randomize(uint8_t *buf, int len)
     return AVERROR(EINVAL);
 }
 
-static int do_encrypt(AVFormatContext *s)
+static int do_encrypt(AVFormatContext *s, VariantStream *vs)
 {
     HLSContext *hls = s->priv_data;
     int ret;
@@ -425,7 +445,7 @@ static int do_encrypt(AVFormatContext *s)
     AVIOContext *pb;
     uint8_t key[KEYSIZE];
 
-    len = strlen(hls->basename) + 4 + 1;
+    len = strlen(s->filename) + 4 + 1;
     hls->key_basename = av_mallocz(len);
     if (!hls->key_basename)
         return AVERROR(ENOMEM);
@@ -446,7 +466,7 @@ static int do_encrypt(AVFormatContext *s)
         char buf[33];
 
         if (!hls->iv) {
-            AV_WB64(iv + 8, hls->sequence);
+            AV_WB64(iv + 8, vs->sequence);
         } else {
             memcpy(iv, hls->iv, sizeof(iv));
         }
@@ -546,7 +566,7 @@ static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
     return len;
 }
 
-static int hls_mux_init(AVFormatContext *s)
+static int hls_mux_init(AVFormatContext *s, VariantStream *vs)
 {
     AVDictionary *options = NULL;
     HLSContext *hls = s->priv_data;
@@ -555,13 +575,13 @@ static int hls_mux_init(AVFormatContext *s)
     int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
     int i, ret;
 
-    ret = avformat_alloc_output_context2(&hls->avf, hls->oformat, NULL, NULL);
+    ret = avformat_alloc_output_context2(&vs->avf, vs->oformat, NULL, NULL);
     if (ret < 0)
         return ret;
-    oc = hls->avf;
+    oc = vs->avf;
 
     oc->filename[0]        = '\0';
-    oc->oformat            = hls->oformat;
+    oc->oformat            = vs->oformat;
     oc->interrupt_callback = s->interrupt_callback;
     oc->max_delay          = s->max_delay;
     oc->opaque             = s->opaque;
@@ -569,57 +589,59 @@ static int hls_mux_init(AVFormatContext *s)
     oc->io_close           = s->io_close;
     av_dict_copy(&oc->metadata, s->metadata, 0);
 
-    if(hls->vtt_oformat) {
-        ret = avformat_alloc_output_context2(&hls->vtt_avf, hls->vtt_oformat, NULL, NULL);
+    if(vs->vtt_oformat) {
+        ret = avformat_alloc_output_context2(&vs->vtt_avf, vs->vtt_oformat, NULL, NULL);
         if (ret < 0)
             return ret;
-        vtt_oc          = hls->vtt_avf;
-        vtt_oc->oformat = hls->vtt_oformat;
+        vtt_oc          = vs->vtt_avf;
+        vtt_oc->oformat = vs->vtt_oformat;
         av_dict_copy(&vtt_oc->metadata, s->metadata, 0);
     }
 
-    for (i = 0; i < s->nb_streams; i++) {
+    for (i = 0; i < vs->nb_streams; i++) {
         AVStream *st;
         AVFormatContext *loc;
-        if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
+        if (vs->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
             loc = vtt_oc;
         else
             loc = oc;
 
         if (!(st = avformat_new_stream(loc, NULL)))
             return AVERROR(ENOMEM);
-        avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
+        avcodec_parameters_copy(st->codecpar, vs->streams[i]->codecpar);
         if (!oc->oformat->codec_tag ||
-            av_codec_get_id (oc->oformat->codec_tag, s->streams[i]->codecpar->codec_tag) == st->codecpar->codec_id ||
-            av_codec_get_tag(oc->oformat->codec_tag, s->streams[i]->codecpar->codec_id) <= 0) {
-            st->codecpar->codec_tag = s->streams[i]->codecpar->codec_tag;
+            av_codec_get_id (oc->oformat->codec_tag, vs->streams[i]->codecpar->codec_tag) == st->codecpar->codec_id ||
+            av_codec_get_tag(oc->oformat->codec_tag, vs->streams[i]->codecpar->codec_id) <= 0) {
+            st->codecpar->codec_tag = vs->streams[i]->codecpar->codec_tag;
         } else {
             st->codecpar->codec_tag = 0;
         }
 
-        st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
-        st->time_base = s->streams[i]->time_base;
-        av_dict_copy(&st->metadata, s->streams[i]->metadata, 0);
+        st->sample_aspect_ratio = vs->streams[i]->sample_aspect_ratio;
+        st->time_base = vs->streams[i]->time_base;
+        av_dict_copy(&st->metadata, vs->streams[i]->metadata, 0);
     }
-    hls->packets_written = 1;
-    hls->start_pos = 0;
-    hls->new_start = 1;
-    hls->fmp4_init_mode = 0;
+
+    vs->packets_written = 1;
+    vs->start_pos = 0;
+    vs->new_start = 1;
+    vs->fmp4_init_mode = 0;
 
     if (hls->segment_type == SEGMENT_TYPE_FMP4) {
         if (hls->max_seg_size > 0) {
             av_log(s, AV_LOG_WARNING, "Multi-file byterange mode is currently unsupported in the HLS muxer.\n");
             return AVERROR_PATCHWELCOME;
         }
-        hls->packets_written = 0;
-        hls->init_range_length = 0;
-        hls->fmp4_init_mode = !byterange_mode;
+
+        vs->packets_written = 0;
+        vs->init_range_length = 0;
+        vs->fmp4_init_mode = !byterange_mode;
         set_http_options(s, &options, hls);
         if ((ret = avio_open_dyn_buf(&oc->pb)) < 0)
             return ret;
 
-        if ((ret = s->io_open(s, &hls->out, hls->base_output_dirname, AVIO_FLAG_WRITE, &options)) < 0) {
-            av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", hls->fmp4_init_filename);
+        if ((ret = s->io_open(s, &vs->out, vs->base_output_dirname, AVIO_FLAG_WRITE, &options)) < 0) {
+            av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", vs->fmp4_init_filename);
             return ret;
         }
 
@@ -659,19 +681,20 @@ static HLSSegment *find_segment_by_filename(HLSSegment *segment, const char *fil
     return (HLSSegment *) NULL;
 }
 
-static int sls_flags_filename_process(struct AVFormatContext *s, HLSContext *hls, HLSSegment *en, double duration,
-                                         int64_t pos, int64_t size)
+static int sls_flags_filename_process(struct AVFormatContext *s, HLSContext *hls,
+                                      VariantStream *vs, HLSSegment *en,
+                                      double duration, int64_t pos, int64_t size)
 {
     if ((hls->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) &&
-        strlen(hls->current_segment_final_filename_fmt)) {
-        av_strlcpy(hls->avf->filename, hls->current_segment_final_filename_fmt, sizeof(hls->avf->filename));
+        strlen(vs->current_segment_final_filename_fmt)) {
+        av_strlcpy(vs->avf->filename, vs->current_segment_final_filename_fmt, sizeof(vs->avf->filename));
         if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
-            char * filename = av_strdup(hls->avf->filename);  // %%s will be %s after strftime
+            char * filename = av_strdup(vs->avf->filename);  // %%s will be %s after strftime
             if (!filename) {
                 av_free(en);
                 return AVERROR(ENOMEM);
             }
-            if (replace_int_data_in_filename(hls->avf->filename, sizeof(hls->avf->filename),
+            if (replace_int_data_in_filename(vs->avf->filename, sizeof(vs->avf->filename),
                 filename, 's', pos + size) < 1) {
                 av_log(hls, AV_LOG_ERROR,
                        "Invalid second level segment filename template '%s', "
@@ -684,12 +707,12 @@ static int sls_flags_filename_process(struct AVFormatContext *s, HLSContext *hls
             av_free(filename);
         }
         if (hls->flags & HLS_SECOND_LEVEL_SEGMENT_DURATION) {
-            char * filename = av_strdup(hls->avf->filename);  // %%t will be %t after strftime
+            char * filename = av_strdup(vs->avf->filename);  // %%t will be %t after strftime
             if (!filename) {
                 av_free(en);
                 return AVERROR(ENOMEM);
             }
-            if (replace_int_data_in_filename(hls->avf->filename, sizeof(hls->avf->filename),
+            if (replace_int_data_in_filename(vs->avf->filename, sizeof(vs->avf->filename),
                 filename, 't',  (int64_t)round(duration * HLS_MICROSECOND_UNIT)) < 1) {
                 av_log(hls, AV_LOG_ERROR,
                        "Invalid second level segment filename template '%s', "
@@ -728,9 +751,9 @@ static int sls_flag_check_duration_size_index(HLSContext *hls)
     return ret;
 }
 
-static int sls_flag_check_duration_size(HLSContext *hls)
+static int sls_flag_check_duration_size(HLSContext *hls, VariantStream *vs)
 {
-    const char *proto = avio_find_protocol_name(hls->basename);
+    const char *proto = avio_find_protocol_name(vs->basename);
     int segment_renaming_ok = proto && !strcmp(proto, "file");
     int ret = 0;
 
@@ -748,14 +771,14 @@ static int sls_flag_check_duration_size(HLSContext *hls)
     return ret;
 }
 
-static void sls_flag_file_rename(HLSContext *hls, char *old_filename) {
+static void sls_flag_file_rename(HLSContext *hls, VariantStream *vs, char *old_filename) {
     if ((hls->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) &&
-        strlen(hls->current_segment_final_filename_fmt)) {
-        ff_rename(old_filename, hls->avf->filename, hls);
+        strlen(vs->current_segment_final_filename_fmt)) {
+        ff_rename(old_filename, vs->avf->filename, hls);
     }
 }
 
-static int sls_flag_use_localtime_filename(AVFormatContext *oc, HLSContext *c)
+static int sls_flag_use_localtime_filename(AVFormatContext *oc, HLSContext *c, VariantStream *vs)
 {
     if (c->flags & HLS_SECOND_LEVEL_SEGMENT_INDEX) {
         char * filename = av_strdup(oc->filename);  // %%d will be %d after strftime
@@ -763,9 +786,9 @@ static int sls_flag_use_localtime_filename(AVFormatContext *oc, HLSContext *c)
             return AVERROR(ENOMEM);
         if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
 #if FF_API_HLS_WRAP
-            filename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+            filename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
 #else
-            filename, 'd', c->sequence) < 1) {
+            filename, 'd', vs->sequence) < 1) {
 #endif
             av_log(c, AV_LOG_ERROR, "Invalid second level segment filename template '%s', "
                     "you can try to remove second_level_segment_index flag\n",
@@ -776,8 +799,8 @@ static int sls_flag_use_localtime_filename(AVFormatContext *oc, HLSContext *c)
         av_free(filename);
     }
     if (c->flags & (HLS_SECOND_LEVEL_SEGMENT_SIZE | HLS_SECOND_LEVEL_SEGMENT_DURATION)) {
-        av_strlcpy(c->current_segment_final_filename_fmt, oc->filename,
-                   sizeof(c->current_segment_final_filename_fmt));
+        av_strlcpy(vs->current_segment_final_filename_fmt, oc->filename,
+                   sizeof(vs->current_segment_final_filename_fmt));
         if (c->flags & HLS_SECOND_LEVEL_SEGMENT_SIZE) {
             char * filename = av_strdup(oc->filename);  // %%s will be %s after strftime
             if (!filename)
@@ -809,8 +832,9 @@ static int sls_flag_use_localtime_filename(AVFormatContext *oc, HLSContext *c)
 }
 
 /* Create a new segment and append it to the segment list */
-static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls, double duration,
-                              int64_t pos, int64_t size)
+static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls,
+                              VariantStream *vs, double duration, int64_t pos,
+                              int64_t size)
 {
     HLSSegment *en = av_malloc(sizeof(*en));
     const char  *filename;
@@ -820,24 +844,24 @@ static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls, double
     if (!en)
         return AVERROR(ENOMEM);
 
-    ret = sls_flags_filename_process(s, hls, en, duration, pos, size);
+    ret = sls_flags_filename_process(s, hls, vs, en, duration, pos, size);
     if (ret < 0) {
         return ret;
     }
 
-    filename = av_basename(hls->avf->filename);
+    filename = av_basename(vs->avf->filename);
 
     if (hls->use_localtime_mkdir) {
-        filename = hls->avf->filename;
+        filename = vs->avf->filename;
     }
-    if ((find_segment_by_filename(hls->segments, filename) || find_segment_by_filename(hls->old_segments, filename))
+    if ((find_segment_by_filename(vs->segments, filename) || find_segment_by_filename(vs->old_segments, filename))
         && !byterange_mode) {
         av_log(hls, AV_LOG_WARNING, "Duplicated segment filename detected: %s\n", filename);
     }
     av_strlcpy(en->filename, filename, sizeof(en->filename));
 
-    if(hls->has_subtitle)
-        av_strlcpy(en->sub_filename, av_basename(hls->vtt_avf->filename), sizeof(en->sub_filename));
+    if(vs->has_subtitle)
+        av_strlcpy(en->sub_filename, av_basename(vs->vtt_avf->filename), sizeof(en->sub_filename));
     else
         en->sub_filename[0] = '\0';
 
@@ -847,9 +871,9 @@ static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls, double
     en->next     = NULL;
     en->discont  = 0;
 
-    if (hls->discontinuity) {
+    if (vs->discontinuity) {
         en->discont = 1;
-        hls->discontinuity = 0;
+        vs->discontinuity = 0;
     }
 
     if (hls->key_info_file || hls->encrypt) {
@@ -857,45 +881,45 @@ static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls, double
         av_strlcpy(en->iv_string, hls->iv_string, sizeof(en->iv_string));
     }
 
-    if (!hls->segments)
-        hls->segments = en;
+    if (!vs->segments)
+        vs->segments = en;
     else
-        hls->last_segment->next = en;
+        vs->last_segment->next = en;
 
-    hls->last_segment = en;
+    vs->last_segment = en;
 
     // EVENT or VOD playlists imply sliding window cannot be used
     if (hls->pl_type != PLAYLIST_TYPE_NONE)
         hls->max_nb_segments = 0;
 
-    if (hls->max_nb_segments && hls->nb_entries >= hls->max_nb_segments) {
-        en = hls->segments;
-        hls->initial_prog_date_time += en->duration;
-        hls->segments = en->next;
+    if (hls->max_nb_segments && vs->nb_entries >= hls->max_nb_segments) {
+        en = vs->segments;
+        vs->initial_prog_date_time += en->duration;
+        vs->segments = en->next;
         if (en && hls->flags & HLS_DELETE_SEGMENTS &&
 #if FF_API_HLS_WRAP
                 !(hls->flags & HLS_SINGLE_FILE || hls->wrap)) {
 #else
                 !(hls->flags & HLS_SINGLE_FILE)) {
 #endif
-            en->next = hls->old_segments;
-            hls->old_segments = en;
-            if ((ret = hls_delete_old_segments(s, hls)) < 0)
+            en->next = vs->old_segments;
+            vs->old_segments = en;
+            if ((ret = hls_delete_old_segments(s, hls, vs)) < 0)
                 return ret;
         } else
             av_free(en);
     } else
-        hls->nb_entries++;
+        vs->nb_entries++;
 
     if (hls->max_seg_size > 0) {
         return 0;
     }
-    hls->sequence++;
+    vs->sequence++;
 
     return 0;
 }
 
-static int parse_playlist(AVFormatContext *s, const char *url)
+static int parse_playlist(AVFormatContext *s, const char *url, VariantStream *vs)
 {
     HLSContext *hls = s->priv_data;
     AVIOContext *in;
@@ -916,26 +940,26 @@ static int parse_playlist(AVFormatContext *s, const char *url)
         goto fail;
     }
 
-    hls->discontinuity = 0;
+    vs->discontinuity = 0;
     while (!avio_feof(in)) {
         read_chomp_line(in, line, sizeof(line));
         if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
             int64_t tmp_sequence = strtoll(ptr, NULL, 10);
-            if (tmp_sequence < hls->sequence)
+            if (tmp_sequence < vs->sequence)
               av_log(hls, AV_LOG_VERBOSE,
                      "Found playlist sequence number was smaller """
                      "than specified start sequence number: %"PRId64" < %"PRId64", "
                      "omitting\n", tmp_sequence, hls->start_sequence);
             else {
               av_log(hls, AV_LOG_DEBUG, "Found playlist sequence number: %"PRId64"\n", tmp_sequence);
-              hls->sequence = tmp_sequence;
+              vs->sequence = tmp_sequence;
             }
         } else if (av_strstart(line, "#EXT-X-DISCONTINUITY", &ptr)) {
             is_segment = 1;
-            hls->discontinuity = 1;
+            vs->discontinuity = 1;
         } else if (av_strstart(line, "#EXTINF:", &ptr)) {
             is_segment = 1;
-            hls->duration = atof(ptr);
+            vs->duration = atof(ptr);
         } else if (av_stristart(line, "#EXT-X-KEY:", &ptr)) {
             ptr = av_stristr(line, "URI=\"");
             if (ptr) {
@@ -964,13 +988,13 @@ static int parse_playlist(AVFormatContext *s, const char *url)
         } else if (line[0]) {
             if (is_segment) {
                 is_segment = 0;
-                new_start_pos = avio_tell(hls->avf->pb);
-                hls->size = new_start_pos - hls->start_pos;
-                av_strlcpy(hls->avf->filename, line, sizeof(line));
-                ret = hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);
+                new_start_pos = avio_tell(vs->avf->pb);
+                vs->size = new_start_pos - vs->start_pos;
+                av_strlcpy(vs->avf->filename, line, sizeof(line));
+                ret = hls_append_segment(s, hls, vs, vs->duration, vs->start_pos, vs->size);
                 if (ret < 0)
                     goto fail;
-                hls->start_pos = new_start_pos;
+                vs->start_pos = new_start_pos;
             }
         }
     }
@@ -1015,7 +1039,7 @@ static void hls_rename_temp_file(AVFormatContext *s, AVFormatContext *oc)
     oc->filename[len-4] = '\0';
 }
 
-static int hls_window(AVFormatContext *s, int last)
+static int hls_window(AVFormatContext *s, int last, VariantStream *vs)
 {
     HLSContext *hls = s->priv_data;
     HLSSegment *en;
@@ -1024,7 +1048,7 @@ static int hls_window(AVFormatContext *s, int last)
     AVIOContext *out = NULL;
     AVIOContext *sub_out = NULL;
     char temp_filename[1024];
-    int64_t sequence = FFMAX(hls->start_sequence, hls->sequence - hls->nb_entries);
+    int64_t sequence = FFMAX(hls->start_sequence, vs->sequence - vs->nb_entries);
     int version = 3;
     const char *proto = avio_find_protocol_name(s->filename);
     int use_rename = proto && !strcmp(proto, "file");
@@ -1032,7 +1056,7 @@ static int hls_window(AVFormatContext *s, int last)
     char *key_uri = NULL;
     char *iv_string = NULL;
     AVDictionary *options = NULL;
-    double prog_date_time = hls->initial_prog_date_time;
+    double prog_date_time = vs->initial_prog_date_time;
     int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
 
     if (byterange_mode) {
@@ -1048,16 +1072,16 @@ static int hls_window(AVFormatContext *s, int last)
         av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");
 
     set_http_options(s, &options, hls);
-    snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);
+    snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", vs->m3u8_name);
     if ((ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, &options)) < 0)
         goto fail;
 
-    for (en = hls->segments; en; en = en->next) {
+    for (en = vs->segments; en; en = en->next) {
         if (target_duration <= en->duration)
             target_duration = get_int_from_double(en->duration);
     }
 
-    hls->discontinuity_set = 0;
+    vs->discontinuity_set = 0;
     write_m3u8_head_block(hls, out, version, target_duration, sequence);
     if (hls->pl_type == PLAYLIST_TYPE_EVENT) {
         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:EVENT\n");
@@ -1065,11 +1089,11 @@ static int hls_window(AVFormatContext *s, int last)
         avio_printf(out, "#EXT-X-PLAYLIST-TYPE:VOD\n");
     }
 
-    if((hls->flags & HLS_DISCONT_START) && sequence==hls->start_sequence && hls->discontinuity_set==0 ){
+    if((hls->flags & HLS_DISCONT_START) && sequence==hls->start_sequence && vs->discontinuity_set==0 ){
         avio_printf(out, "#EXT-X-DISCONTINUITY\n");
-        hls->discontinuity_set = 1;
+        vs->discontinuity_set = 1;
     }
-    for (en = hls->segments; en; en = en->next) {
+    for (en = vs->segments; en; en = en->next) {
         if ((hls->encrypt || hls->key_info_file) && (!key_uri || strcmp(en->key_uri, key_uri) ||
                                     av_strcasecmp(en->iv_string, iv_string))) {
             avio_printf(out, "#EXT-X-KEY:METHOD=AES-128,URI=\"%s\"", en->key_uri);
@@ -1084,8 +1108,8 @@ static int hls_window(AVFormatContext *s, int last)
             avio_printf(out, "#EXT-X-DISCONTINUITY\n");
         }
 
-        if ((hls->segment_type == SEGMENT_TYPE_FMP4) && (en == hls->segments)) {
-            avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", hls->fmp4_init_filename);
+        if ((hls->segment_type == SEGMENT_TYPE_FMP4) && (en == vs->segments)) {
+            avio_printf(out, "#EXT-X-MAP:URI=\"%s\"", vs->fmp4_init_filename);
             if (hls->flags & HLS_SINGLE_FILE) {
                 avio_printf(out, ",BYTERANGE=\"%"PRId64"@%"PRId64"\"", en->size, en->pos);
             }
@@ -1123,26 +1147,26 @@ static int hls_window(AVFormatContext *s, int last)
             avio_printf(out, "#EXT-X-PROGRAM-DATE-TIME:%s.%03d%s\n", buf0, milli, buf1);
             prog_date_time += en->duration;
         }
-        if (hls->baseurl)
-            avio_printf(out, "%s", hls->baseurl);
+        if (vs->baseurl)
+            avio_printf(out, "%s", vs->baseurl);
         avio_printf(out, "%s\n", en->filename);
     }
 
     if (last && (hls->flags & HLS_OMIT_ENDLIST)==0)
         avio_printf(out, "#EXT-X-ENDLIST\n");
 
-    if( hls->vtt_m3u8_name ) {
-        if ((ret = s->io_open(s, &sub_out, hls->vtt_m3u8_name, AVIO_FLAG_WRITE, &options)) < 0)
+    if( vs->vtt_m3u8_name ) {
+        if ((ret = s->io_open(s, &sub_out, vs->vtt_m3u8_name, AVIO_FLAG_WRITE, &options)) < 0)
             goto fail;
         write_m3u8_head_block(hls, sub_out, version, target_duration, sequence);
 
-        for (en = hls->segments; en; en = en->next) {
+        for (en = vs->segments; en; en = en->next) {
             avio_printf(sub_out, "#EXTINF:%f,\n", en->duration);
             if (byterange_mode)
                  avio_printf(sub_out, "#EXT-X-BYTERANGE:%"PRIi64"@%"PRIi64"\n",
                          en->size, en->pos);
-            if (hls->baseurl)
-                avio_printf(sub_out, "%s", hls->baseurl);
+            if (vs->baseurl)
+                avio_printf(sub_out, "%s", vs->baseurl);
             avio_printf(sub_out, "%s\n", en->sub_filename);
         }
 
@@ -1156,33 +1180,33 @@ fail:
     ff_format_io_close(s, &out);
     ff_format_io_close(s, &sub_out);
     if (ret >= 0 && use_rename)
-        ff_rename(temp_filename, s->filename, s);
+        ff_rename(temp_filename, vs->m3u8_name, s);
     return ret;
 }
 
-static int hls_start(AVFormatContext *s)
+static int hls_start(AVFormatContext *s, VariantStream *vs)
 {
     HLSContext *c = s->priv_data;
-    AVFormatContext *oc = c->avf;
-    AVFormatContext *vtt_oc = c->vtt_avf;
+    AVFormatContext *oc = vs->avf;
+    AVFormatContext *vtt_oc = vs->vtt_avf;
     AVDictionary *options = NULL;
     char *filename, iv_string[KEYSIZE*2 + 1];
     int err = 0;
 
     if (c->flags & HLS_SINGLE_FILE) {
-        av_strlcpy(oc->filename, c->basename,
+        av_strlcpy(oc->filename, vs->basename,
                    sizeof(oc->filename));
-        if (c->vtt_basename)
-            av_strlcpy(vtt_oc->filename, c->vtt_basename,
+        if (vs->vtt_basename)
+            av_strlcpy(vtt_oc->filename, vs->vtt_basename,
                   sizeof(vtt_oc->filename));
     } else if (c->max_seg_size > 0) {
         if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
 #if FF_API_HLS_WRAP
-            c->basename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+            vs->basename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
 #else
-            c->basename, 'd', c->sequence) < 1) {
+            vs->basename, 'd', vs->sequence) < 1) {
 #endif
-                av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s', you can try to use -use_localtime 1 with it\n", c->basename);
+                av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s', you can try to use -use_localtime 1 with it\n", vs->basename);
                 return AVERROR(EINVAL);
         }
     } else {
@@ -1191,12 +1215,12 @@ static int hls_start(AVFormatContext *s)
             struct tm *tm, tmpbuf;
             time(&now0);
             tm = localtime_r(&now0, &tmpbuf);
-            if (!strftime(oc->filename, sizeof(oc->filename), c->basename, tm)) {
+            if (!strftime(oc->filename, sizeof(oc->filename), vs->basename, tm)) {
                 av_log(oc, AV_LOG_ERROR, "Could not get segment filename with use_localtime\n");
                 return AVERROR(EINVAL);
             }
 
-            err = sls_flag_use_localtime_filename(oc, c);
+            err = sls_flag_use_localtime_filename(oc, c, vs);
             if (err < 0) {
                 return AVERROR(ENOMEM);
             }
@@ -1217,26 +1241,26 @@ static int hls_start(AVFormatContext *s)
             }
         } else if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
 #if FF_API_HLS_WRAP
-                   c->basename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+                   vs->basename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
 #else
-                   c->basename, 'd', c->sequence) < 1) {
+                   vs->basename, 'd', vs->sequence) < 1) {
 #endif
-            av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s' you can try to use -use_localtime 1 with it\n", c->basename);
+            av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s' you can try to use -use_localtime 1 with it\n", vs->basename);
             return AVERROR(EINVAL);
         }
-        if( c->vtt_basename) {
+        if( vs->vtt_basename) {
             if (replace_int_data_in_filename(vtt_oc->filename, sizeof(vtt_oc->filename),
 #if FF_API_HLS_WRAP
-                c->vtt_basename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+                vs->vtt_basename, 'd', c->wrap ? vs->sequence % c->wrap : vs->sequence) < 1) {
 #else
-                c->vtt_basename, 'd', c->sequence) < 1) {
+                vs->vtt_basename, 'd', vs->sequence) < 1) {
 #endif
-                av_log(vtt_oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->vtt_basename);
+                av_log(vtt_oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", vs->vtt_basename);
                 return AVERROR(EINVAL);
             }
        }
     }
-    c->number++;
+    vs->number++;
 
     set_http_options(s, &options, c);
 
@@ -1250,21 +1274,22 @@ static int hls_start(AVFormatContext *s)
                   " will use -hls_key_info_file priority\n");
         }
 
-        if (c->number <= 1 || (c->flags & HLS_PERIODIC_REKEY)) {
+        if (!c->encrypt_started || (c->flags & HLS_PERIODIC_REKEY)) {
             if (c->key_info_file) {
                 if ((err = hls_encryption_start(s)) < 0)
                     goto fail;
             } else {
-                if ((err = do_encrypt(s)) < 0)
+                if ((err = do_encrypt(s, vs)) < 0)
                     goto fail;
             }
+            c->encrypt_started = 1;
         }
         if ((err = av_dict_set(&options, "encryption_key", c->key_string, 0))
                 < 0)
             goto fail;
         err = av_strlcpy(iv_string, c->iv_string, sizeof(iv_string));
         if (!err)
-            snprintf(iv_string, sizeof(iv_string), "%032"PRIx64, c->sequence);
+            snprintf(iv_string, sizeof(iv_string), "%032"PRIx64, vs->sequence);
         if ((err = av_dict_set(&options, "encryption_iv", iv_string, 0)) < 0)
            goto fail;
 
@@ -1281,7 +1306,7 @@ static int hls_start(AVFormatContext *s)
     } else
         if ((err = s->io_open(s, &oc->pb, oc->filename, AVIO_FLAG_WRITE, &options)) < 0)
             goto fail;
-    if (c->vtt_basename) {
+    if (vs->vtt_basename) {
         set_http_options(s, &options, c);
         if ((err = s->io_open(s, &vtt_oc->pb, vtt_oc->filename, AVIO_FLAG_WRITE, &options)) < 0)
             goto fail;
@@ -1303,7 +1328,7 @@ static int hls_start(AVFormatContext *s)
         }
     }
 
-    if (c->vtt_basename) {
+    if (vs->vtt_basename) {
         err = avformat_write_header(vtt_oc,NULL);
         if (err < 0)
             return err;
@@ -1332,19 +1357,186 @@ static const char * get_default_pattern_localtime_fmt(AVFormatContext *s)
     return (HAVE_LIBC_MSVCRT || !strftime(b, sizeof(b), "%s", p) || !strcmp(b, "%s")) ? "-%Y%m%d%H%M%S.ts" : "-%s.ts";
 }
 
+static int format_name(char *name, int name_buf_len, int i)
+{
+    char *p;
+    char extension[10] = {'\0'};
+
+    p = strrchr(name, '.');
+    if (p) {
+        av_strlcpy(extension, p, sizeof(extension));
+        *p = '\0';
+    }
+
+    snprintf(name + strlen(name), name_buf_len - strlen(name), POSTFIX_PATTERN, i);
+
+    if (strlen(extension))
+        av_strlcat(name, extension, name_buf_len);
+
+    return 0;
+}
+
+static int get_nth_codec_stream_index(AVFormatContext *s,
+                                      enum AVMediaType codec_type,
+                                      int stream_id)
+{
+    unsigned int stream_index, cnt;
+    if (stream_id < 0 || stream_id > s->nb_streams - 1)
+        return -1;
+    cnt = 0;
+    for (stream_index = 0; stream_index < s->nb_streams; stream_index++) {
+        if (s->streams[stream_index]->codecpar->codec_type != codec_type)
+            continue;
+        if (cnt == stream_id)
+            return stream_index;
+        cnt++;
+    }
+    return -1;
+}
+
+static int parse_variant_stream_mapstring(AVFormatContext *s)
+{
+    HLSContext *hls = s->priv_data;
+    VariantStream *vs;
+    int stream_index;
+    enum AVMediaType codec_type;
+    int nb_varstreams, nb_streams;
+    char *p, *q, *saveptr1, *saveptr2, *varstr, *keyval;
+    const char *val;
+
+    /**
+     * Expected format for var_stream_map string is as below:
+     * "a:0,v:0 a:1,v:1"
+     * This string specifies how to group the audio, video and subtitle streams
+     * into different variant streams. The variant stream groups are separated
+     * by space.
+     *
+     * a:, v:, s: are keys to specify audio, video and subtitle streams
+     * respectively. Allowed values are 0 to 9 digits (limited just based on
+     * practical usage)
+     *
+     */
+    p = av_strdup(hls->var_stream_map);
+    q = p;
+    while(av_strtok(q, " \t", &saveptr1)) {
+        q = NULL;
+        hls->nb_varstreams++;
+    }
+    av_freep(&p);
+
+    hls->var_streams = av_mallocz(sizeof(*hls->var_streams) * hls->nb_varstreams);
+    if (!hls->var_streams)
+        return AVERROR(ENOMEM);
+
+    p = hls->var_stream_map;
+    nb_varstreams = 0;
+    while (varstr = av_strtok(p, " \t", &saveptr1)) {
+        p = NULL;
+
+        if (nb_varstreams < hls->nb_varstreams)
+            vs = &(hls->var_streams[nb_varstreams++]);
+        else
+            return AVERROR(EINVAL);
+
+        q = varstr;
+        while (q < varstr + strlen(varstr)) {
+            if (!av_strncasecmp(q, "a:", 2) || !av_strncasecmp(q, "v:", 2) ||
+                !av_strncasecmp(q, "s:", 2))
+                vs->nb_streams++;
+            q++;
+        }
+        vs->streams = av_mallocz(sizeof(AVStream *) * vs->nb_streams);
+        if (!vs->streams)
+            return AVERROR(ENOMEM);
+
+        nb_streams = 0;
+        while (keyval = av_strtok(varstr, ",", &saveptr2)) {
+            varstr = NULL;
+
+            if (av_strstart(keyval, "v:", &val)) {
+                codec_type = AVMEDIA_TYPE_VIDEO;
+            } else if (av_strstart(keyval, "a:", &val)) {
+                codec_type = AVMEDIA_TYPE_AUDIO;
+            } else if (av_strstart(keyval, "s:", &val)) {
+                codec_type = AVMEDIA_TYPE_SUBTITLE;
+            } else {
+                av_log(s, AV_LOG_ERROR, "Invalid keyval %s\n", keyval);
+                return AVERROR(EINVAL);
+            }
+
+            stream_index = -1;
+            if (av_isdigit(*val))
+                stream_index = get_nth_codec_stream_index (s, codec_type,
+                                                           atoi(val));
+
+            if (stream_index >= 0 && nb_streams < vs->nb_streams) {
+                vs->streams[nb_streams++] = s->streams[stream_index];
+            } else {
+                av_log(s, AV_LOG_ERROR, "Unable to map stream at %s\n", keyval);
+                return AVERROR(EINVAL);
+            }
+        }
+    }
+    av_log(s, AV_LOG_DEBUG, "Number of variant streams %d\n",
+            hls->nb_varstreams);
+
+    return 0;
+}
+
+static int update_variant_stream_info(AVFormatContext *s) {
+    HLSContext *hls = s->priv_data;
+    unsigned int i;
+
+    if (hls->var_stream_map) {
+        return parse_variant_stream_mapstring(s);
+    } else {
+        //By default, a single variant stream with all the codec streams is created
+        hls->nb_varstreams = 1;
+        hls->var_streams = av_mallocz(sizeof(*hls->var_streams) *
+                                             hls->nb_varstreams);
+        if (!hls->var_streams)
+            return AVERROR(ENOMEM);
+
+        hls->var_streams[0].nb_streams = s->nb_streams;
+        hls->var_streams[0].streams = av_mallocz(sizeof(AVStream *) *
+                                            hls->var_streams[0].nb_streams);
+        if (!hls->var_streams[0].streams)
+            return AVERROR(ENOMEM);
+
+        for (i = 0; i < s->nb_streams; i++)
+            hls->var_streams[0].streams[i] = s->streams[i];
+    }
+    return 0;
+}
+
 static int hls_write_header(AVFormatContext *s)
 {
     HLSContext *hls = s->priv_data;
-    int ret, i;
+    int ret, i, j;
     char *p = NULL;
     const char *pattern = "%d.ts";
     const char *pattern_localtime_fmt = get_default_pattern_localtime_fmt(s);
     const char *vtt_pattern = "%d.vtt";
     AVDictionary *options = NULL;
     int basename_size = 0;
-    int vtt_basename_size = 0;
+    int vtt_basename_size = 0, m3u8_name_size = 0;
+    VariantStream *vs = NULL;
     int fmp4_init_filename_len = strlen(hls->fmp4_init_filename) + 1;
 
+    ret = update_variant_stream_info(s);
+    if (ret < 0) {
+        av_log(s, AV_LOG_ERROR, "Variant stream info update failed with status %x\n",
+                ret);
+        goto fail;
+    }
+
+    //TODO: Updates needed to encryption functionality with periodic re-key when more than one variant streams are present
+    if (hls->nb_varstreams > 1 && hls->flags & HLS_PERIODIC_REKEY) {
+        ret = AVERROR(EINVAL);
+        av_log(s, AV_LOG_ERROR, "Periodic re-key not supported when more than one variant streams are present\n");
+        goto fail;
+    }
+
     if (hls->segment_type == SEGMENT_TYPE_FMP4) {
         pattern = "%d.m4s";
     }
@@ -1365,15 +1557,18 @@ static int hls_write_header(AVFormatContext *s)
         av_log(hls, AV_LOG_DEBUG, "start_number evaluated to %"PRId64"\n", hls->start_sequence);
     }
 
-    hls->sequence       = hls->start_sequence;
+    for (i = 0; i < hls->nb_varstreams; i++) {
+        vs = &hls->var_streams[i];
+
+    vs->sequence       = hls->start_sequence;
     hls->recording_time = (hls->init_time ? hls->init_time : hls->time) * AV_TIME_BASE;
-    hls->start_pts      = AV_NOPTS_VALUE;
-    hls->current_segment_final_filename_fmt[0] = '\0';
+    vs->start_pts      = AV_NOPTS_VALUE;
+    vs->current_segment_final_filename_fmt[0] = '\0';
 
     if (hls->flags & HLS_PROGRAM_DATE_TIME) {
         time_t now0;
         time(&now0);
-        hls->initial_prog_date_time = now0;
+        vs->initial_prog_date_time = now0;
     }
 
     if (hls->format_options_str) {
@@ -1384,43 +1579,49 @@ static int hls_write_header(AVFormatContext *s)
         }
     }
 
-    for (i = 0; i < s->nb_streams; i++) {
-        hls->has_video +=
-            s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
-        hls->has_subtitle +=
-            s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE;
+    for (j = 0; j < vs->nb_streams; j++) {
+        vs->has_video +=
+            vs->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
+        vs->has_subtitle +=
+            vs->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE;
     }
 
-    if (hls->has_video > 1)
+    if (vs->has_video > 1)
         av_log(s, AV_LOG_WARNING,
                "More than a single video stream present, "
                "expect issues decoding it.\n");
 
     if (hls->segment_type == SEGMENT_TYPE_FMP4) {
-        hls->oformat = av_guess_format("mp4", NULL, NULL);
+        vs->oformat = av_guess_format("mp4", NULL, NULL);
     } else {
-        hls->oformat = av_guess_format("mpegts", NULL, NULL);
+        vs->oformat = av_guess_format("mpegts", NULL, NULL);
     }
 
-    if (!hls->oformat) {
+    if (!vs->oformat) {
         ret = AVERROR_MUXER_NOT_FOUND;
         goto fail;
     }
 
-    if(hls->has_subtitle) {
-        hls->vtt_oformat = av_guess_format("webvtt", NULL, NULL);
-        if (!hls->oformat) {
+    if(vs->has_subtitle) {
+        vs->vtt_oformat = av_guess_format("webvtt", NULL, NULL);
+        if (!vs->oformat) {
             ret = AVERROR_MUXER_NOT_FOUND;
             goto fail;
         }
     }
 
     if (hls->segment_filename) {
-        hls->basename = av_strdup(hls->segment_filename);
-        if (!hls->basename) {
+        basename_size = strlen(hls->segment_filename) + 1;
+        if (hls->nb_varstreams > 1) {
+            basename_size += strlen(POSTFIX_PATTERN);
+        }
+        vs->basename = av_malloc(basename_size);
+        if (!vs->basename) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }
+
+        av_strlcpy(vs->basename, hls->segment_filename, basename_size);
     } else {
         if (hls->flags & HLS_SINGLE_FILE) {
             if (hls->segment_type == SEGMENT_TYPE_FMP4) {
@@ -1435,52 +1636,96 @@ static int hls_write_header(AVFormatContext *s)
         } else {
             basename_size = strlen(s->filename) + strlen(pattern) + 1;
         }
-        hls->basename = av_malloc(basename_size);
-        if (!hls->basename) {
+
+        if (hls->nb_varstreams > 1) {
+            basename_size += strlen(POSTFIX_PATTERN);
+        }
+
+        vs->basename = av_malloc(basename_size);
+        if (!vs->basename) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }
 
-        av_strlcpy(hls->basename, s->filename, basename_size);
+        av_strlcpy(vs->basename, s->filename, basename_size);
 
-        p = strrchr(hls->basename, '.');
+        p = strrchr(vs->basename, '.');
         if (p)
             *p = '\0';
         if (hls->use_localtime) {
-            av_strlcat(hls->basename, pattern_localtime_fmt, basename_size);
+            av_strlcat(vs->basename, pattern_localtime_fmt, basename_size);
         } else {
-            av_strlcat(hls->basename, pattern, basename_size);
+            av_strlcat(vs->basename, pattern, basename_size);
         }
     }
 
+    m3u8_name_size = strlen(s->filename) + 1;
+    if (hls->nb_varstreams > 1) {
+        m3u8_name_size += strlen(POSTFIX_PATTERN);
+    }
+
+    vs->m3u8_name = av_malloc(m3u8_name_size);
+    if (!vs->m3u8_name ) {
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    av_strlcpy(vs->m3u8_name, s->filename, m3u8_name_size);
+
+    if (hls->nb_varstreams > 1) {
+        ret = format_name(vs->basename, basename_size, i);
+        if (ret < 0)
+             goto fail;
+        ret = format_name(vs->m3u8_name, m3u8_name_size, i);
+        if (ret < 0)
+             goto fail;
+    }
+
     if (hls->segment_type == SEGMENT_TYPE_FMP4) {
+        if (hls->nb_varstreams > 1)
+            fmp4_init_filename_len += strlen(POSTFIX_PATTERN);
+        vs->fmp4_init_filename = av_malloc(fmp4_init_filename_len);
+        if (!vs->fmp4_init_filename ) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        av_strlcpy(vs->fmp4_init_filename, hls->fmp4_init_filename,
+                fmp4_init_filename_len);
+        if (hls->nb_varstreams > 1) {
+            ret = format_name(vs->fmp4_init_filename, fmp4_init_filename_len, i);
+            if (ret < 0)
+                 goto fail;
+        }
+
         if (av_strcasecmp(hls->fmp4_init_filename, "init.mp4")) {
-            hls->base_output_dirname = av_malloc(fmp4_init_filename_len);
-            if (!hls->base_output_dirname) {
+            fmp4_init_filename_len = strlen(vs->fmp4_init_filename) + 1;
+            vs->base_output_dirname = av_malloc(fmp4_init_filename_len);
+            if (!vs->base_output_dirname) {
                 ret = AVERROR(ENOMEM);
                 goto fail;
             }
-            av_strlcpy(hls->base_output_dirname, hls->fmp4_init_filename, fmp4_init_filename_len);
+            av_strlcpy(vs->base_output_dirname, vs->fmp4_init_filename,
+                    fmp4_init_filename_len);
         } else {
-            if (basename_size > 0) {
-                hls->base_output_dirname = av_malloc(basename_size);
-            } else {
-                hls->base_output_dirname = av_malloc(strlen(hls->fmp4_init_filename) + 1);
-            }
-            if (!hls->base_output_dirname) {
+            fmp4_init_filename_len = strlen(vs->m3u8_name) +
+                                         strlen(vs->fmp4_init_filename) + 1;
+
+            vs->base_output_dirname = av_malloc(fmp4_init_filename_len);
+            if (!vs->base_output_dirname) {
                 ret = AVERROR(ENOMEM);
                 goto fail;
             }
 
-            if (basename_size > 0) {
-                av_strlcpy(hls->base_output_dirname, s->filename, basename_size);
-                p = strrchr(hls->base_output_dirname, '/');
-            }
+            av_strlcpy(vs->base_output_dirname, vs->m3u8_name,
+                    fmp4_init_filename_len);
+            p = strrchr(vs->base_output_dirname, '/');
             if (p) {
                 *(p + 1) = '\0';
-                av_strlcat(hls->base_output_dirname, hls->fmp4_init_filename, basename_size);
+                av_strlcat(vs->base_output_dirname, vs->fmp4_init_filename,
+                        fmp4_init_filename_len);
             } else {
-                av_strlcpy(hls->base_output_dirname, hls->fmp4_init_filename, fmp4_init_filename_len);
+                av_strlcpy(vs->base_output_dirname, vs->fmp4_init_filename,
+                        fmp4_init_filename_len);
             }
         }
     }
@@ -1491,54 +1736,78 @@ static int hls_write_header(AVFormatContext *s)
              goto fail;
         }
     } else {
-        ret = sls_flag_check_duration_size(hls);
+        ret = sls_flag_check_duration_size(hls, vs);
         if (ret < 0) {
              goto fail;
         }
     }
-    if(hls->has_subtitle) {
+    if(vs->has_subtitle) {
 
         if (hls->flags & HLS_SINGLE_FILE)
             vtt_pattern = ".vtt";
         vtt_basename_size = strlen(s->filename) + strlen(vtt_pattern) + 1;
-        hls->vtt_basename = av_malloc(vtt_basename_size);
-        if (!hls->vtt_basename) {
+        if (hls->nb_varstreams > 1) {
+            vtt_basename_size += strlen(POSTFIX_PATTERN);
+        }
+
+        vs->vtt_basename = av_malloc(vtt_basename_size);
+        if (!vs->vtt_basename) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }
-        hls->vtt_m3u8_name = av_malloc(vtt_basename_size);
-        if (!hls->vtt_m3u8_name ) {
+        vs->vtt_m3u8_name = av_malloc(vtt_basename_size);
+        if (!vs->vtt_m3u8_name ) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }
-        av_strlcpy(hls->vtt_basename, s->filename, vtt_basename_size);
-        p = strrchr(hls->vtt_basename, '.');
+        av_strlcpy(vs->vtt_basename, s->filename, vtt_basename_size);
+        p = strrchr(vs->vtt_basename, '.');
         if (p)
             *p = '\0';
 
         if( hls->subtitle_filename ) {
-            strcpy(hls->vtt_m3u8_name, hls->subtitle_filename);
+            strcpy(vs->vtt_m3u8_name, hls->subtitle_filename);
         } else {
-            strcpy(hls->vtt_m3u8_name, hls->vtt_basename);
-            av_strlcat(hls->vtt_m3u8_name, "_vtt.m3u8", vtt_basename_size);
+            strcpy(vs->vtt_m3u8_name, vs->vtt_basename);
+            av_strlcat(vs->vtt_m3u8_name, "_vtt.m3u8", vtt_basename_size);
         }
-        av_strlcat(hls->vtt_basename, vtt_pattern, vtt_basename_size);
+        av_strlcat(vs->vtt_basename, vtt_pattern, vtt_basename_size);
+
+        if (hls->nb_varstreams > 1) {
+            ret= format_name(vs->vtt_basename, vtt_basename_size, i);
+            if (ret < 0)
+                 goto fail;
+            ret = format_name(vs->vtt_m3u8_name, vtt_basename_size, i);
+            if (ret < 0)
+                 goto fail;
+        }
+    }
+
+    if (hls->baseurl) {
+        int baseurl_len;
+        baseurl_len = strlen(hls->baseurl);
+        vs->baseurl = av_malloc(baseurl_len);
+        if (!vs->baseurl) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
+        av_strlcpy(vs->baseurl, hls->baseurl, baseurl_len);
     }
 
     if ((hls->flags & HLS_SINGLE_FILE) && (hls->segment_type == SEGMENT_TYPE_FMP4)) {
-        hls->fmp4_init_filename  = av_strdup(hls->basename);
-        if (!hls->fmp4_init_filename) {
+        vs->fmp4_init_filename  = av_strdup(vs->basename);
+        if (!vs->fmp4_init_filename) {
             ret = AVERROR(ENOMEM);
             goto fail;
         }
     }
 
-    if ((ret = hls_mux_init(s)) < 0)
+    if ((ret = hls_mux_init(s, vs)) < 0)
         goto fail;
 
     if (hls->flags & HLS_APPEND_LIST) {
-        parse_playlist(s, s->filename);
-        hls->discontinuity = 1;
+        parse_playlist(s, vs->m3u8_name, vs);
+        vs->discontinuity = 1;
         if (hls->init_time > 0) {
             av_log(s, AV_LOG_WARNING, "append_list mode does not support hls_init_time,"
                    " hls_init_time value will have no effect\n");
@@ -1548,21 +1817,23 @@ static int hls_write_header(AVFormatContext *s)
     }
 
     if (hls->segment_type != SEGMENT_TYPE_FMP4 || hls->flags & HLS_SINGLE_FILE) {
-        if ((ret = hls_start(s)) < 0)
+        if ((ret = hls_start(s, vs)) < 0)
             goto fail;
     }
 
     av_dict_copy(&options, hls->format_options, 0);
-    ret = avformat_write_header(hls->avf, &options);
+    ret = avformat_write_header(vs->avf, &options);
     if (av_dict_count(options)) {
         av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);
         ret = AVERROR(EINVAL);
+        av_dict_free(&options);
         goto fail;
     }
+    av_dict_free(&options);
     //av_assert0(s->nb_streams == hls->avf->nb_streams);
-    for (i = 0; i < s->nb_streams; i++) {
+    for (j = 0; j < vs->nb_streams; j++) {
         AVStream *inner_st;
-        AVStream *outer_st = s->streams[i];
+        AVStream *outer_st = vs->streams[j];
 
         if (hls->max_seg_size > 0) {
             if ((outer_st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
@@ -1574,9 +1845,9 @@ static int hls_write_header(AVFormatContext *s)
         }
 
         if (outer_st->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE)
-            inner_st = hls->avf->streams[i];
-        else if (hls->vtt_avf)
-            inner_st = hls->vtt_avf->streams[0];
+            inner_st = vs->avf->streams[j];
+        else if (vs->vtt_avf)
+            inner_st = vs->vtt_avf->streams[0];
         else {
             /* We have a subtitle stream, when the user does not want one */
             inner_st = NULL;
@@ -1584,19 +1855,27 @@ static int hls_write_header(AVFormatContext *s)
         }
         avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
     }
+    }
 fail:
 
-    av_dict_free(&options);
     if (ret < 0) {
-        av_freep(&hls->fmp4_init_filename);
-        av_freep(&hls->basename);
-        av_freep(&hls->vtt_basename);
         av_freep(&hls->key_basename);
-        if (hls->avf)
-            avformat_free_context(hls->avf);
-        if (hls->vtt_avf)
-            avformat_free_context(hls->vtt_avf);
+        for (i = 0; i < hls->nb_varstreams && hls->var_streams; i++) {
+            vs = &hls->var_streams[i];
+            av_freep(&vs->basename);
+            av_freep(&vs->vtt_basename);
+            av_freep(&vs->fmp4_init_filename);
+            av_freep(&vs->m3u8_name);
+            av_freep(&vs->vtt_m3u8_name);
+            av_freep(&vs->streams);
+            av_freep(&vs->baseurl);
+            if (vs->avf)
+                avformat_free_context(vs->avf);
+            if (vs->vtt_avf)
+                avformat_free_context(vs->vtt_avf);
 
+        }
+        av_freep(&hls->var_streams);
     }
     return ret;
 }
@@ -1606,34 +1885,54 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
     HLSContext *hls = s->priv_data;
     AVFormatContext *oc = NULL;
     AVStream *st = s->streams[pkt->stream_index];
-    int64_t end_pts = hls->recording_time * hls->number;
+    int64_t end_pts = 0;
     int is_ref_pkt = 1;
-    int ret = 0, can_split = 1;
+    int ret = 0, can_split = 1, i, j;
     int stream_index = 0;
     int range_length = 0;
     uint8_t *buffer = NULL;
+    VariantStream *vs = NULL;
+
+    for (i = 0; i < hls->nb_varstreams; i++) {
+        vs = &hls->var_streams[i];
+        for (j = 0; j < vs->nb_streams; j++) {
+            if (vs->streams[j] == st) {
+                if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
+                    oc = vs->vtt_avf;
+                    stream_index = 0;
+                } else {
+                    oc = vs->avf;
+                    stream_index = j;
+                }
+                break;
+            }
+        }
+
+        if (oc)
+            break;
+    }
+
+    if (!oc) {
+        av_log(s, AV_LOG_ERROR, "Unable to find mapping variant stream\n");
+        return AVERROR(ENOMEM);
+    }
+
+    end_pts = hls->recording_time * vs->number;
 
-    if (hls->sequence - hls->nb_entries > hls->start_sequence && hls->init_time > 0) {
+    if (vs->sequence - vs->nb_entries > hls->start_sequence && hls->init_time > 0) {
         /* reset end_pts, hls->recording_time at end of the init hls list */
-        int init_list_dur = hls->init_time * hls->nb_entries * AV_TIME_BASE;
-        int after_init_list_dur = (hls->sequence - hls->nb_entries ) * hls->time * AV_TIME_BASE;
+        int init_list_dur = hls->init_time * vs->nb_entries * AV_TIME_BASE;
+        int after_init_list_dur = (vs->sequence - vs->nb_entries ) * hls->time * AV_TIME_BASE;
         hls->recording_time = hls->time * AV_TIME_BASE;
         end_pts = init_list_dur + after_init_list_dur ;
     }
 
-    if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
-        oc = hls->vtt_avf;
-        stream_index = 0;
-    } else {
-        oc = hls->avf;
-        stream_index = pkt->stream_index;
-    }
-    if (hls->start_pts == AV_NOPTS_VALUE) {
-        hls->start_pts = pkt->pts;
-        hls->end_pts   = pkt->pts;
+    if (vs->start_pts == AV_NOPTS_VALUE) {
+        vs->start_pts = pkt->pts;
+        vs->end_pts   = pkt->pts;
     }
 
-    if (hls->has_video) {
+    if (vs->has_video) {
         can_split = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
                     ((pkt->flags & AV_PKT_FLAG_KEY) || (hls->flags & HLS_SPLIT_BY_TIME));
         is_ref_pkt = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
@@ -1642,92 +1941,92 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
         is_ref_pkt = can_split = 0;
 
     if (is_ref_pkt) {
-        if (hls->new_start) {
-            hls->new_start = 0;
-            hls->duration = (double)(pkt->pts - hls->end_pts)
+        if (vs->new_start) {
+            vs->new_start = 0;
+            vs->duration = (double)(pkt->pts - vs->end_pts)
                                        * st->time_base.num / st->time_base.den;
-            hls->dpp = (double)(pkt->duration) * st->time_base.num / st->time_base.den;
+            vs->dpp = (double)(pkt->duration) * st->time_base.num / st->time_base.den;
         } else {
             if (pkt->duration) {
-                hls->duration += (double)(pkt->duration) * st->time_base.num / st->time_base.den;
+                vs->duration += (double)(pkt->duration) * st->time_base.num / st->time_base.den;
             } else {
                 av_log(s, AV_LOG_WARNING, "pkt->duration = 0, maybe the hls segment duration will not precise\n");
-                hls->duration = (double)(pkt->pts - hls->end_pts) * st->time_base.num / st->time_base.den;
+                vs->duration = (double)(pkt->pts - vs->end_pts) * st->time_base.num / st->time_base.den;
             }
         }
 
     }
-    if (hls->packets_written && can_split && av_compare_ts(pkt->pts - hls->start_pts, st->time_base,
+
+    if (vs->packets_written && can_split && av_compare_ts(pkt->pts - vs->start_pts, st->time_base,
                                    end_pts, AV_TIME_BASE_Q) >= 0) {
         int64_t new_start_pos;
-        char *old_filename = av_strdup(hls->avf->filename);
+        char *old_filename = av_strdup(vs->avf->filename);
         int byterange_mode = (hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size > 0);
 
         if (!old_filename) {
             return AVERROR(ENOMEM);
         }
 
-        av_write_frame(hls->avf, NULL); /* Flush any buffered data */
+        av_write_frame(vs->avf, NULL); /* Flush any buffered data */
 
-        new_start_pos = avio_tell(hls->avf->pb);
-        hls->size = new_start_pos - hls->start_pos;
+        new_start_pos = avio_tell(vs->avf->pb);
+        vs->size = new_start_pos - vs->start_pos;
 
         if (!byterange_mode) {
-            if (hls->segment_type == SEGMENT_TYPE_FMP4 && !hls->init_range_length) {
+            if (hls->segment_type == SEGMENT_TYPE_FMP4 && !vs->init_range_length) {
                 avio_flush(oc->pb);
                 range_length = avio_close_dyn_buf(oc->pb, &buffer);
-                avio_write(hls->out, buffer, range_length);
-                hls->init_range_length = range_length;
+                avio_write(vs->out, buffer, range_length);
+                vs->init_range_length = range_length;
                 avio_open_dyn_buf(&oc->pb);
-                hls->packets_written = 0;
-                ff_format_io_close(s, &hls->out);
+                vs->packets_written = 0;
+                ff_format_io_close(s, &vs->out);
             } else {
                 ff_format_io_close(s, &oc->pb);
             }
-            if (hls->vtt_avf) {
-                ff_format_io_close(s, &hls->vtt_avf->pb);
+            if (vs->vtt_avf) {
+                ff_format_io_close(s, &vs->vtt_avf->pb);
             }
         }
         if ((hls->flags & HLS_TEMP_FILE) && oc->filename[0]) {
             if (!(hls->flags & HLS_SINGLE_FILE) || (hls->max_seg_size <= 0))
-                if ((hls->avf->oformat->priv_class && hls->avf->priv_data) && hls->segment_type != SEGMENT_TYPE_FMP4)
-                    av_opt_set(hls->avf->priv_data, "mpegts_flags", "resend_headers", 0);
+                if ((vs->avf->oformat->priv_class && vs->avf->priv_data) && hls->segment_type != SEGMENT_TYPE_FMP4)
+                    av_opt_set(vs->avf->priv_data, "mpegts_flags", "resend_headers", 0);
             hls_rename_temp_file(s, oc);
         }
 
-        if (hls->fmp4_init_mode) {
-            hls->number--;
+        if (vs->fmp4_init_mode) {
+            vs->number--;
         }
 
-        if (!hls->fmp4_init_mode || byterange_mode)
-            ret = hls_append_segment(s, hls, hls->duration, hls->start_pos, hls->size);
-
-        hls->start_pos = new_start_pos;
+        if (!vs->fmp4_init_mode || byterange_mode)
+            ret = hls_append_segment(s, hls, vs, vs->duration, vs->start_pos, vs->size);
+        vs->start_pos = new_start_pos;
         if (ret < 0) {
             av_free(old_filename);
             return ret;
         }
 
-        hls->end_pts = pkt->pts;
-        hls->duration = 0;
+        vs->end_pts = pkt->pts;
+        vs->duration = 0;
 
-        hls->fmp4_init_mode = 0;
+        vs->fmp4_init_mode = 0;
         if (hls->flags & HLS_SINGLE_FILE) {
-            hls->number++;
+            vs->number++;
         } else if (hls->max_seg_size > 0) {
-            if (hls->start_pos >= hls->max_seg_size) {
-                hls->sequence++;
-                sls_flag_file_rename(hls, old_filename);
-                ret = hls_start(s);
-                hls->start_pos = 0;
+            if (vs->start_pos >= hls->max_seg_size) {
+                vs->sequence++;
+                sls_flag_file_rename(hls, vs, old_filename);
+                ret = hls_start(s, vs);
+                vs->start_pos = 0;
                 /* When split segment by byte, the duration is short than hls_time,
                  * so it is not enough one segment duration as hls_time, */
-                hls->number--;
+                vs->number--;
             }
-            hls->number++;
+            vs->number++;
         } else {
-            sls_flag_file_rename(hls, old_filename);
-            ret = hls_start(s);
+            sls_flag_file_rename(hls, vs, old_filename);
+            ret = hls_start(s, vs);
         }
         av_free(old_filename);
 
@@ -1735,13 +2034,13 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
             return ret;
         }
 
-        if (!hls->fmp4_init_mode || byterange_mode)
-            if ((ret = hls_window(s, 0)) < 0) {
+        if (!vs->fmp4_init_mode || byterange_mode)
+            if ((ret = hls_window(s, 0, vs)) < 0) {
                 return ret;
             }
     }
 
-    hls->packets_written++;
+    vs->packets_written++;
     ret = ff_write_chained(oc, stream_index, pkt, s, 0);
 
     return ret;
@@ -1750,9 +2049,18 @@ static int hls_write_packet(AVFormatContext *s, AVPacket *pkt)
 static int hls_write_trailer(struct AVFormatContext *s)
 {
     HLSContext *hls = s->priv_data;
-    AVFormatContext *oc = hls->avf;
-    AVFormatContext *vtt_oc = hls->vtt_avf;
-    char *old_filename = av_strdup(hls->avf->filename);
+    AVFormatContext *oc = NULL;
+    AVFormatContext *vtt_oc = NULL;
+    char *old_filename = NULL;
+    int i;
+    VariantStream *vs = NULL;
+
+    for (i = 0; i < hls->nb_varstreams; i++) {
+        vs = &hls->var_streams[i];
+
+    oc = vs->avf;
+    vtt_oc = vs->vtt_avf;
+    old_filename = av_strdup(vs->avf->filename);
 
     if (!old_filename) {
         return AVERROR(ENOMEM);
@@ -1761,7 +2069,7 @@ static int hls_write_trailer(struct AVFormatContext *s)
 
     av_write_trailer(oc);
     if (oc->pb) {
-        hls->size = avio_tell(hls->avf->pb) - hls->start_pos;
+        vs->size = avio_tell(vs->avf->pb) - vs->start_pos;
         ff_format_io_close(s, &oc->pb);
 
         if ((hls->flags & HLS_TEMP_FILE) && oc->filename[0]) {
@@ -1769,35 +2077,41 @@ static int hls_write_trailer(struct AVFormatContext *s)
         }
 
         /* after av_write_trailer, then duration + 1 duration per packet */
-        hls_append_segment(s, hls, hls->duration + hls->dpp, hls->start_pos, hls->size);
+        hls_append_segment(s, hls, vs, vs->duration + vs->dpp, vs->start_pos, vs->size);
     }
 
-    sls_flag_file_rename(hls, old_filename);
+    sls_flag_file_rename(hls, vs, old_filename);
 
     if (vtt_oc) {
         if (vtt_oc->pb)
             av_write_trailer(vtt_oc);
-        hls->size = avio_tell(hls->vtt_avf->pb) - hls->start_pos;
+        vs->size = avio_tell(vs->vtt_avf->pb) - vs->start_pos;
         ff_format_io_close(s, &vtt_oc->pb);
     }
-    av_freep(&hls->basename);
-    av_freep(&hls->base_output_dirname);
-    av_freep(&hls->key_basename);
+    av_freep(&vs->basename);
+    av_freep(&vs->base_output_dirname);
     avformat_free_context(oc);
 
-    hls->avf = NULL;
-    hls_window(s, 1);
+    vs->avf = NULL;
+    hls_window(s, 1, vs);
 
-    av_freep(&hls->fmp4_init_filename);
+    av_freep(&vs->fmp4_init_filename);
     if (vtt_oc) {
-        av_freep(&hls->vtt_basename);
-        av_freep(&hls->vtt_m3u8_name);
+        av_freep(&vs->vtt_basename);
+        av_freep(&vs->vtt_m3u8_name);
         avformat_free_context(vtt_oc);
     }
 
-    hls_free_segments(hls->segments);
-    hls_free_segments(hls->old_segments);
+    hls_free_segments(vs->segments);
+    hls_free_segments(vs->old_segments);
     av_free(old_filename);
+    av_freep(&vs->m3u8_name);
+    av_freep(&vs->streams);
+    av_freep(&vs->baseurl);
+    }
+
+    av_freep(&hls->key_basename);
+    av_freep(&hls->var_streams);
     return 0;
 }
 
@@ -1852,6 +2166,7 @@ static const AVOption options[] = {
     {"epoch", "seconds since epoch", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_START_SEQUENCE_AS_SECONDS_SINCE_EPOCH }, INT_MIN, INT_MAX, E, "start_sequence_source_type" },
     {"datetime", "current datetime as YYYYMMDDhhmmss", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_START_SEQUENCE_AS_FORMATTED_DATETIME }, INT_MIN, INT_MAX, E, "start_sequence_source_type" },
     {"http_user_agent", "override User-Agent field in HTTP header", OFFSET(user_agent), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
+    {"var_stream_map", "Variant stream map string", OFFSET(var_stream_map), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
     { NULL },
 };