[FFmpeg-trac] #4552(avformat:new): Broken timestamps for msmpeg4v2 in avi

[FFmpeg]

#4552: Broken timestamps for msmpeg4v2 in avi
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  important  |              Component:  avformat
                Version:  git-       |               Keywords:  avi msmpeg4
  master                             |  dts regression
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 A user uploaded a sample for which bad timestamps are produced since
 ae8168074eb1c8230d9c6482102ca08a70a9c4b0 - possibly related to ticket
 #4042.
 {{{
 $ ffmpeg -i A-223555-223610-00324.avi -qscale 2 out.avi
 ffmpeg version N-72081-gec38a1b Copyright (c) 2000-2015 the FFmpeg
 developers
   built with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      54. 23.101 / 54. 23.101
   libavcodec     56. 38.101 / 56. 38.101
   libavformat    56. 33.101 / 56. 33.101
   libavdevice    56.  4.100 / 56.  4.100
   libavfilter     5. 16.101 /  5. 16.101
   libswscale      3.  1.101 /  3.  1.101
   libswresample   1.  1.100 /  1.  1.100
   libpostproc    53.  3.100 / 53.  3.100
 [avi @ 0x1c56320] non-interleaved AVI
 Guessed Channel Layout for  Input Stream #0.1 : mono
 Input #0, avi, from 'A-223555-223610-00324.avi':
   Duration: 00:00:15.04, start: 0.000000, bitrate: 837 kb/s
     Stream #0:0: Video: msmpeg4v2 (MP42 / 0x3234504D), yuv420p, 384x288,
 763 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
     Stream #0:1: Audio: pcm_u8 ([1][0][0][0] / 0x0001), 8000 Hz, 1
 channels, u8, 64 kb/s
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf56.33.101
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 384x288,
 q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
     Metadata:
       encoder         : Lavc56.38.101 mpeg4
     Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 8000 Hz, mono, fltp, 96
 kb/s
     Metadata:
       encoder         : Lavc56.38.101 ac3
 Stream mapping:
   Stream #0:0 -> #0:0 (msmpeg4v2 (native) -> mpeg4 (native))
   Stream #0:1 -> #0:1 (pcm_u8 (native) -> ac3 (native))
 Press [q] to stop, [?] for help
 [avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 2,
 current: 0; changing to 3. This may result in incorrect timestamps in the
 output file.
 [avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 3,
 current: 0; changing to 4. This may result in incorrect timestamps in the
 output file.
 [avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 4,
 current: 0; changing to 5. This may result in incorrect timestamps in the
 output file.

 ...

 [avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 74,
 current: 0; changing to 75. This may result in incorrect timestamps in the
 output file.
 [avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 75,
 current: 0; changing to 76. This may result in incorrect timestamps in the
 output file.
 [avi @ 0x1c692c0] Non-monotonous DTS in output stream 0:1; previous: 76,
 current: 0; changing to 77. This may result in incorrect timestamps in the
 output file.
 frame=  324 fps=0.0 q=2.0 Lsize=    4146kB time=00:00:15.04
 bitrate=2258.4kbits/s
 video:3950kB audio:176kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.496279%
 }}}
 Playing the file with FFplay leads to heavy A/V desync.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4552>
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