Fix various unused variable warnings

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

31 files changed, 40 insertions, 55 deletions

diff --git a/ffmpeg.c b/ffmpeg.c
index 3f4cc2fd04..29f6950d08 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -3720,7 +3720,7 @@ static void new_audio_stream(AVFormatContext *oc, int file_idx)
 static void new_data_stream(AVFormatContext *oc, int file_idx)
 {
     AVStream *st;
-    AVOutputStream *ost;
+    AVOutputStream *ost av_unused;
     AVCodec *codec=NULL;
     AVCodecContext *data_enc;
 
diff --git a/ffplay.c b/ffplay.c
index 9b9b665385..ffe1c0f12d 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -1438,7 +1438,7 @@ static int queue_picture(VideoState *is, AVFrame *src_frame, double pts1, int64_
 
 static int get_video_frame(VideoState *is, AVFrame *frame, int64_t *pts, AVPacket *pkt)
 {
-    int len1, got_picture, i;
+    int len1 av_unused, got_picture, i;
 
     if (packet_queue_get(&is->videoq, pkt, 1) < 0)
         return -1;
@@ -1813,7 +1813,7 @@ static int subtitle_thread(void *arg)
     VideoState *is = arg;
     SubPicture *sp;
     AVPacket pkt1, *pkt = &pkt1;
-    int len1, got_subtitle;
+    int len1 av_unused, got_subtitle;
     double pts;
     int i, j;
     int r, g, b, y, u, v, a;
diff --git a/libavcodec/a64multienc.c b/libavcodec/a64multienc.c
index e9b3471925..5a665d0592 100644
--- a/libavcodec/a64multienc.c
+++ b/libavcodec/a64multienc.c
@@ -252,7 +252,6 @@ static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
     int b_width;
 
     int req_size;
-    int num_frames   = c->mc_lifetime;
 
     int *charmap     = c->mc_charmap;
     uint8_t *colram  = c->mc_colram;
@@ -280,7 +279,6 @@ static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
         if (!c->mc_lifetime) return 0;
         /* no more frames in queue, prepare to flush remaining frames */
         if (!c->mc_frame_counter) {
-            num_frames = c->mc_lifetime;
             c->mc_lifetime = 0;
         }
         /* still frames in queue so limit lifetime to remaining frames */
diff --git a/libavcodec/celp_filters.c b/libavcodec/celp_filters.c
index 26a62eed14..8b68c2ffef 100644
--- a/libavcodec/celp_filters.c
+++ b/libavcodec/celp_filters.c
@@ -109,7 +109,7 @@ void ff_celp_lp_synthesis_filterf(float *out, const float *filter_coeffs,
     old_out2 = out[-2];
     old_out3 = out[-1];
     for (n = 0; n <= buffer_length - 4; n+=4) {
-        float tmp0,tmp1,tmp2,tmp3;
+        float tmp0,tmp1,tmp2;
         float val;
 
         out0 = in[0];
@@ -160,7 +160,6 @@ void ff_celp_lp_synthesis_filterf(float *out, const float *filter_coeffs,
         tmp0 = out0;
         tmp1 = out1;
         tmp2 = out2;
-        tmp3 = out3;
 
         out3 -= a * tmp2;
         out2 -= a * tmp1;
diff --git a/libavcodec/dca.c b/libavcodec/dca.c
index 74bae4e295..074f998995 100644
--- a/libavcodec/dca.c
+++ b/libavcodec/dca.c
@@ -1535,8 +1535,8 @@ static void dca_exss_parse_header(DCAContext *s)
 {
     int ss_index;
     int blownup;
-    int header_size;
-    int hd_size;
+    int header_size av_unused;
+    int hd_size av_unused;
     int num_audiop = 1;
     int num_assets = 1;
     int active_ss_mask[8];
@@ -1622,7 +1622,6 @@ static int dca_decode_frame(AVCodecContext * avctx,
 {
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
-    int data_size_tmp;
 
     int lfe_samples;
     int num_core_channels = 0;
diff --git a/libavcodec/dirac.c b/libavcodec/dirac.c
index c8dc7a0f62..f39e9996d6 100644
--- a/libavcodec/dirac.c
+++ b/libavcodec/dirac.c
@@ -245,7 +245,7 @@ static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
 int ff_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
                                    dirac_source_params *source)
 {
-    unsigned version_major, version_minor;
+    unsigned version_major, version_minor av_unused;
     unsigned video_format, picture_coding_mode;
 
     version_major  = svq3_get_ue_golomb(gb);
diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
index cbecfa8a87..2ce7ea00b6 100644
--- a/libavcodec/rv10.c
+++ b/libavcodec/rv10.c
@@ -235,7 +235,7 @@ int rv_decode_dc(MpegEncContext *s, int n)
 /* read RV 1.0 compatible frame header */
 static int rv10_decode_picture_header(MpegEncContext *s)
 {
-    int mb_count, pb_frame, marker, unk, mb_xy;
+    int mb_count, pb_frame, marker, unk av_unused, mb_xy;
 
     marker = get_bits1(&s->gb);
 
diff --git a/libavcodec/s302m.c b/libavcodec/s302m.c
index d8b2b38a02..d707208b6c 100644
--- a/libavcodec/s302m.c
+++ b/libavcodec/s302m.c
@@ -29,7 +29,7 @@ static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
                                     int buf_size)
 {
     uint32_t h;
-    int frame_size, channels, id, bits;
+    int frame_size, channels, id av_unused, bits;
 
     if (buf_size <= AES3_HEADER_LEN) {
         av_log(avctx, AV_LOG_ERROR, "frame is too short\n");
diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index f50da4e87f..b2a05cc259 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -196,7 +196,7 @@ static int decode_wave_header(AVCodecContext *avctx, uint8_t *header, int header
 {
     GetBitContext hb;
     int len;
-    int chunk_size;
+    int chunk_size av_unused;
     short wave_format;
 
     init_get_bits(&hb, header, header_size*8);
diff --git a/libavcodec/sp5xdec.c b/libavcodec/sp5xdec.c
index 1af978f21b..0b56c101db 100644
--- a/libavcodec/sp5xdec.c
+++ b/libavcodec/sp5xdec.c
@@ -38,15 +38,12 @@ static int sp5x_decode_frame(AVCodecContext *avctx,
     int buf_size = avpkt->size;
     AVPacket avpkt_recoded;
     const int qscale = 5;
-    const uint8_t *buf_ptr;
     uint8_t *recoded;
     int i = 0, j = 0;
 
     if (!avctx->width || !avctx->height)
         return -1;
 
-    buf_ptr = buf;
-
     recoded = av_mallocz(buf_size + 1024);
     if (!recoded)
         return -1;
diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index 122049c957..f09a5edd99 100644
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -201,7 +201,6 @@ static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
 {
     uint32_t magic;
     const uint8_t *obuf;
-    int length;
 
     obuf = buf;
 
@@ -212,7 +211,7 @@ static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
 /*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
         return 40;
     } else if(magic == 0x00000101) { /* new header */
-        int w, h, size, flags, xr, yr;
+        av_unused int w, h, size, flags, xr, yr, length;
 
         length = AV_RL32(buf);
         buf += 4;
diff --git a/libavcodec/vaapi_mpeg2.c b/libavcodec/vaapi_mpeg2.c
index 3b3f6e0444..6c92a0ff72 100644
--- a/libavcodec/vaapi_mpeg2.c
+++ b/libavcodec/vaapi_mpeg2.c
@@ -109,7 +109,7 @@ static int vaapi_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer
     MpegEncContext * const s = avctx->priv_data;
     VASliceParameterBufferMPEG2 *slice_param;
     GetBitContext gb;
-    uint32_t start_code, quantiser_scale_code, intra_slice_flag, macroblock_offset;
+    uint32_t start_code av_unused, quantiser_scale_code, intra_slice_flag, macroblock_offset;
 
     av_dlog(avctx, "vaapi_mpeg2_decode_slice(): buffer %p, size %d\n", buffer, size);
 
diff --git a/libavcodec/vmdav.c b/libavcodec/vmdav.c
index 8d8bc61e42..934a52b939 100644
--- a/libavcodec/vmdav.c
+++ b/libavcodec/vmdav.c
@@ -199,7 +199,6 @@ static void vmd_decode(VmdVideoContext *s)
 
     int frame_x, frame_y;
     int frame_width, frame_height;
-    int dp_size;
 
     frame_x = AV_RL16(&s->buf[6]);
     frame_y = AV_RL16(&s->buf[8]);
@@ -247,7 +246,6 @@ static void vmd_decode(VmdVideoContext *s)
         }
 
         dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x];
-        dp_size = s->frame.linesize[0] * s->avctx->height;
         pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x];
         switch (meth) {
         case 1:
diff --git a/libavcodec/zmbvenc.c b/libavcodec/zmbvenc.c
index 55aa7b936b..4c98987fea 100644
--- a/libavcodec/zmbvenc.c
+++ b/libavcodec/zmbvenc.c
@@ -181,7 +181,7 @@ static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void
         int x, y, bh2, bw2, xored;
         uint8_t *tsrc, *tprev;
         uint8_t *mv;
-        int mx, my, bv;
+        int mx, my;
 
         bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
         bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
@@ -197,7 +197,7 @@ static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void
                 tsrc = src + x;
                 tprev = prev + x;
 
-                bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
+                zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
                 mv[0] = (mx << 1) | !!xored;
                 mv[1] = my << 1;
                 tprev += mx + my * c->pstride;
diff --git a/libavfilter/vf_fieldorder.c b/libavfilter/vf_fieldorder.c
index 59ca77821a..0913b6950e 100644
--- a/libavfilter/vf_fieldorder.c
+++ b/libavfilter/vf_fieldorder.c
@@ -153,7 +153,7 @@ static void end_frame(AVFilterLink *inlink)
     AVFilterBufferRef *inpicref   = inlink->cur_buf;
     AVFilterBufferRef *outpicref  = outlink->out_buf;
 
-    int               h, w, plane, line_step, line_size, line;
+    int               h, plane, line_step, line_size, line;
     uint8_t           *cpy_src, *cpy_dst;
 
     if (    inpicref->video->interlaced
@@ -162,7 +162,6 @@ static void end_frame(AVFilterLink *inlink)
                 "picture will move %s one line\n",
                 fieldorder->dst_tff ? "up" : "down");
         h = inpicref->video->h;
-        w = inpicref->video->w;
         for (plane = 0; plane < 4 && inpicref->data[plane]; plane++) {
             line_step = inpicref->linesize[plane];
             line_size = fieldorder->line_size[plane];
diff --git a/libavformat/4xm.c b/libavformat/4xm.c
index 699277248d..42ecbde581 100644
--- a/libavformat/4xm.c
+++ b/libavformat/4xm.c
@@ -246,7 +246,7 @@ static int fourxm_read_packet(AVFormatContext *s,
     FourxmDemuxContext *fourxm = s->priv_data;
     AVIOContext *pb = s->pb;
     unsigned int fourcc_tag;
-    unsigned int size, out_size;
+    unsigned int size, out_size av_unused;
     int ret = 0;
     unsigned int track_number;
     int packet_read = 0;
diff --git a/libavformat/apetag.c b/libavformat/apetag.c
index fb46d2bac2..4a464de1f5 100644
--- a/libavformat/apetag.c
+++ b/libavformat/apetag.c
@@ -35,7 +35,7 @@ static int ape_tag_read_field(AVFormatContext *s)
 {
     AVIOContext *pb = s->pb;
     uint8_t key[1024], *value;
-    uint32_t size, flags;
+    uint32_t size, flags av_unused;
     int i, c;
 
     size = avio_rl32(pb);  /* field size */
diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index 3564bf465f..e2efeef3ea 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -209,7 +209,7 @@ static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
     ff_asf_guid g;
     enum AVMediaType type;
     int type_specific_size, sizeX;
-    uint64_t total_size;
+    uint64_t total_size av_unused;
     unsigned int tag1;
     int64_t pos1, pos2, start_time;
     int test_for_ext_stream_audio, is_dvr_ms_audio=0;
@@ -393,7 +393,7 @@ static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
     AVIOContext *pb = s->pb;
     ff_asf_guid g;
     int ext_len, payload_ext_ct, stream_ct, i;
-    uint32_t ext_d, leak_rate, stream_num;
+    uint32_t ext_d av_unused, leak_rate, stream_num;
     unsigned int stream_languageid_index;
 
     avio_rl64(pb); // starttime
@@ -511,7 +511,7 @@ static int asf_read_metadata(AVFormatContext *s, int64_t size)
 {
     AVIOContext *pb = s->pb;
     ASFContext *asf = s->priv_data;
-    int n, stream_num, name_len, value_len, value_type, value_num;
+    int n, stream_num, name_len, value_len, value_type av_unused, value_num;
     int ret, i;
     n = avio_rl16(pb);
 
@@ -626,7 +626,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
             // if so the next iteration will pick it up
             continue;
         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
-            int v1, v2;
+            av_unused int v1, v2;
             ff_get_guid(pb, &g);
             v1 = avio_rl32(pb);
             v2 = avio_rl16(pb);
@@ -799,7 +799,7 @@ static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
     ASFContext *asf = s->priv_data;
     int rsize = 1;
     int num = avio_r8(pb);
-    int64_t ts0, ts1;
+    int64_t ts0, ts1 av_unused;
 
     asf->packet_segments--;
     asf->packet_key_frame = num >> 7;
diff --git a/libavformat/mmf.c b/libavformat/mmf.c
index fc6fcc3caa..b75bee3a6b 100644
--- a/libavformat/mmf.c
+++ b/libavformat/mmf.c
@@ -186,7 +186,7 @@ static int mmf_read_header(AVFormatContext *s,
     unsigned int tag;
     AVIOContext *pb = s->pb;
     AVStream *st;
-    int64_t file_size, size;
+    int64_t file_size av_unused, size;
     int rate, params;
 
     tag = avio_rl32(pb);
@@ -263,12 +263,10 @@ static int mmf_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {
     MMFContext *mmf = s->priv_data;
-    AVStream *st;
     int ret, size;
 
     if (url_feof(s->pb))
         return AVERROR(EIO);
-    st = s->streams[0];
 
     size = MAX_SIZE;
     if(size > mmf->data_size)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index e51116b304..1af1cdeb63 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -469,21 +469,21 @@ static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
 {
     AVStream *st;
-    int tag, len;
+    int tag;
 
     if (fc->nb_streams < 1)
         return 0;
     st = fc->streams[fc->nb_streams-1];
 
     avio_rb32(pb); /* version + flags */
-    len = ff_mp4_read_descr(fc, pb, &tag);
+    ff_mp4_read_descr(fc, pb, &tag);
     if (tag == MP4ESDescrTag) {
         avio_rb16(pb); /* ID */
         avio_r8(pb); /* priority */
     } else
         avio_rb16(pb); /* ID */
 
-    len = ff_mp4_read_descr(fc, pb, &tag);
+    ff_mp4_read_descr(fc, pb, &tag);
     if (tag == MP4DecConfigDescrTag)
         ff_mp4_read_dec_config_descr(fc, st, pb);
     return 0;
diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index 344bd1ccd8..968cdd90e3 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -197,8 +197,8 @@ static int ogg_read_page(AVFormatContext *s, int *str)
     int flags, nsegs;
     uint64_t gp;
     uint32_t serial;
-    uint32_t seq;
-    uint32_t crc;
+    uint32_t seq av_unused;
+    uint32_t crc av_unused;
     int size, idx;
     uint8_t sync[4];
     int sp = 0;
diff --git a/libavformat/oggparsecelt.c b/libavformat/oggparsecelt.c
index bbb695f438..2adc06046a 100644
--- a/libavformat/oggparsecelt.c
+++ b/libavformat/oggparsecelt.c
@@ -41,8 +41,8 @@ static int celt_header(AVFormatContext *s, int idx)
 
         /* Main header */
 
-        uint32_t version, header_size, sample_rate, nb_channels, frame_size;
-        uint32_t overlap, bytes_per_packet, extra_headers;
+        uint32_t version, header_size av_unused, sample_rate, nb_channels, frame_size;
+        uint32_t overlap, bytes_per_packet av_unused, extra_headers;
         uint8_t *extradata;
 
         extradata = av_malloc(2 * sizeof(uint32_t) +
diff --git a/libavformat/oggparseogm.c b/libavformat/oggparseogm.c
index dda5be601a..ec575e068d 100644
--- a/libavformat/oggparseogm.c
+++ b/libavformat/oggparseogm.c
@@ -39,7 +39,7 @@ ogm_header(AVFormatContext *s, int idx)
     const uint8_t *p = os->buf + os->pstart;
     uint64_t time_unit;
     uint64_t spu;
-    uint32_t default_len;
+    uint32_t default_len av_unused;
 
     if(!(*p & 1))
         return 0;
diff --git a/libavformat/rl2.c b/libavformat/rl2.c
index 93d4c34459..219aa697b6 100644
--- a/libavformat/rl2.c
+++ b/libavformat/rl2.c
@@ -80,8 +80,8 @@ static av_cold int rl2_read_header(AVFormatContext *s,
     unsigned int audio_frame_counter = 0;
     unsigned int video_frame_counter = 0;
     unsigned int back_size;
-    int data_size;
-    unsigned short encoding_method;
+    int data_size av_unused;
+    unsigned short encoding_method av_unused;
     unsigned short sound_rate;
     unsigned short rate;
     unsigned short channels;
diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c
index 6fb362473e..5c24d021e0 100644
--- a/libavformat/rmdec.c
+++ b/libavformat/rmdec.c
@@ -280,7 +280,7 @@ ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
         if (rm_read_audio_stream_info(s, pb, st, rst, 0))
             return -1;
     } else {
-        int fps, fps2;
+        int fps, fps2 av_unused;
         if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
         fail1:
             av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
diff --git a/libavformat/rpl.c b/libavformat/rpl.c
index 9702fc7035..be5bf9c788 100644
--- a/libavformat/rpl.c
+++ b/libavformat/rpl.c
@@ -299,7 +299,7 @@ static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
         stream->codec->codec_tag == 124) {
         // We have to split Escape 124 frames because there are
         // multiple frames per chunk in Escape 124 samples.
-        uint32_t frame_size, frame_flags;
+        uint32_t frame_size, frame_flags av_unused;
 
         frame_flags = avio_rl32(pb);
         frame_size = avio_rl32(pb);
diff --git a/libavformat/rtpdec_latm.c b/libavformat/rtpdec_latm.c
index 2b366a0dc2..74754dfd60 100644
--- a/libavformat/rtpdec_latm.c
+++ b/libavformat/rtpdec_latm.c
@@ -108,7 +108,7 @@ static int parse_fmtp_config(AVStream *st, char *value)
     int len = ff_hex_to_data(NULL, value), i, ret = 0;
     GetBitContext gb;
     uint8_t *config;
-    int audio_mux_version, same_time_framing, num_sub_frames,
+    int audio_mux_version, same_time_framing, num_sub_frames av_unused,
         num_programs, num_layers;
 
     /* Pad this buffer, too, to avoid out of bounds reads with get_bits below */
diff --git a/libavformat/sauce.c b/libavformat/sauce.c
index 41e991e3e7..0b22a75bb9 100644
--- a/libavformat/sauce.c
+++ b/libavformat/sauce.c
@@ -32,7 +32,7 @@ int ff_sauce_read(AVFormatContext *avctx, uint64_t *fsize, int *got_width, int g
 {
     AVIOContext *pb = avctx->pb;
     char buf[36];
-    int datatype, filetype, t1, t2, nb_comments, flags;
+    int datatype, filetype, t1, t2, nb_comments, flags av_unused;
     uint64_t start_pos = avio_size(pb) - 128;
 
     avio_seek(pb, start_pos, SEEK_SET);
diff --git a/libavformat/smacker.c b/libavformat/smacker.c
index 2603a4d71c..29a66e79fa 100644
--- a/libavformat/smacker.c
+++ b/libavformat/smacker.c
@@ -233,7 +233,6 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
     int i;
     int frame_size = 0;
     int palchange = 0;
-    int pos;
 
     if (url_feof(s->pb) || smk->cur_frame >= smk->frames)
         return AVERROR_EOF;
@@ -244,7 +243,6 @@ static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
         frame_size = smk->frm_size[smk->cur_frame] & (~3);
         flags = smk->frm_flags[smk->cur_frame];
         /* handle palette change event */
-        pos = avio_tell(s->pb);
         if(flags & SMACKER_PAL){
             int size, sz, t, off, j, pos;
             uint8_t *pal = smk->pal;
diff --git a/libavformat/sol.c b/libavformat/sol.c
index 7ad894e304..70fddae92a 100644
--- a/libavformat/sol.c
+++ b/libavformat/sol.c
@@ -85,7 +85,7 @@ static int sol_channels(int magic, int type)
 static int sol_read_header(AVFormatContext *s,
                           AVFormatParameters *ap)
 {
-    int size;
+    int size av_unused;
     unsigned int magic,tag;
     AVIOContext *pb = s->pb;
     unsigned int id, channels, rate, type;
diff --git a/libavformat/yuv4mpeg.c b/libavformat/yuv4mpeg.c
index a852568a64..445ec3701b 100644
--- a/libavformat/yuv4mpeg.c
+++ b/libavformat/yuv4mpeg.c
@@ -94,7 +94,7 @@ static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
     AVPicture *picture;
     int* first_pkt = s->priv_data;
     int width, height, h_chroma_shift, v_chroma_shift;
-    int i, m;
+    int i;
     char buf2[Y4M_LINE_MAX+1];
     char buf1[20];
     uint8_t *ptr, *ptr1, *ptr2;
@@ -114,7 +114,7 @@ static int yuv4_write_packet(AVFormatContext *s, AVPacket *pkt)
 
     /* construct frame header */
 
-    m = snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
+    snprintf(buf1, sizeof(buf1), "%s\n", Y4M_FRAME_MAGIC);
     avio_write(pb, buf1, strlen(buf1));
 
     width = st->codec->width;