In mpeg1/2 timestamps (against all logic) are associated with

picture start codes and not with access units. Fix the parser to
handle that properly. This was a very long standing bug ...
The change to the seek regressions is because the mpeg ts muxer
stores too many invalid and randomized timestamps which overflow
the 4 entry buffer we use in the parser.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@13643 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/mpegvideo_parser.c

@@ -29,6 +29,7 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
 {
     ParseContext1 *pc = s->priv_data;
     const uint8_t *buf_end;
+    const uint8_t *buf_start= buf;
     uint32_t start_code;
     int frame_rate_index, ext_type, bytes_left;
     int frame_rate_ext_n, frame_rate_ext_d;
@@ -43,6 +44,8 @@ static void mpegvideo_extract_headers(AVCodecParserContext *s,
         bytes_left = buf_end - buf;
         switch(start_code) {
         case PICTURE_START_CODE:
+            ff_fetch_timestamp(s, buf-buf_start-4, 1);
+
             if (bytes_left >= 2) {
                 s->pict_type = (buf[1] >> 3) & 7;
             }

tests/seek.regression.ref

@@ -3481,7 +3481,7 @@ ret:-1 st:-1 ts:0.460008 flags:0
 ret:-1 st:-1 ts:-0.645825 flags:1
 ----------------
 tests/data/b-libav.ts
-ret: 0 st: 0 dts:-0.040000 pts:0.000000 pos:-1 size:24921 flags:1
+ret: 0 st: 0 dts:0.000000 pts:-102481911520608.625000 pos:-1 size:24921 flags:1
 ret: 0 st:-1 ts:-1.000000 flags:0
 ret: 0 st: 0 dts:0.000000 pts:-102481911520608.625000 pos:-1 size:22036 flags:1
 ret: 0 st:-1 ts:1.894167 flags:1