[FFmpeg-trac] #2340(undetermined:new): A/V desync with dv sample

[FFmpeg]

#2340: A/V desync with dv sample
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:
                Version:  git-       |  undetermined
  master                             |               Keywords:  desync
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.user/44228/focus=44465
 A user uploaded a dv sample that plays fine with QuickTime and mplayer
 -demuxer rawdv, ffplay and ffmpeg show significant A/V desync. The reason
 are error codes in the dv stream that lead to incorrect timestamps. ffplay
 does not show any issues if seeking is used to skip the problematic parts
 of the stream.
 {{{
 $ ffmpeg -i error.dv -qscale 2 out.avi
 ffmpeg version N-50600-g309d6f5 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Mar  8 2013 22:07:22 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 19.100 / 52. 19.100
   libavcodec     54. 92.100 / 54. 92.100
   libavformat    54. 63.104 / 54. 63.104
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 42.103 /  3. 42.103
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 [dv @ 0x317ef40] Estimating duration from bitrate, this may be inaccurate
 Input #0, dv, from 'error.dv':
   Metadata:
     timecode        : 01:09:48:11
   Duration: 00:01:00.03, start: 0.000000, bitrate: 28771 kb/s
     Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 8:9 DAR 4:3], 28771
 kb/s, 29.97 tbr, 29.97 tbn, 29.97 tbc
     Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
 Please use -q:a or -q:v, -qscale is ambiguous
 Output #0, avi, to 'out.avi':
   Metadata:
     ISMP            : 01:09:48:11
     ISFT            : Lavf54.63.104
     Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 720x480 [SAR
 8:9 DAR 4:3], q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc
     Stream #0:1: Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp,
 192 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (dvvideo -> mpeg4)
   Stream #0:1 -> #0:1 (pcm_s16le -> ac3)
 Press [q] to stop, [?] for help
 frame=  303 fps=0.0 q=2.0 size=    2521kB time=00:00:10.11
 bitrate=2042.6kbits/s
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
 [dvvideo @ 0x317f860]     Last message repeated 1 times
     Last message repeated 1 times
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
     Last message repeated 2 times
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=65
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
 AC EOB marker is absent pos=64
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=66
     Last message repeated 2 times
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=65
     Last message repeated 1 times
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=75
     Last message repeated 1 times

 ...

 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=65
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=64
 [dvvideo @ 0x317f860] AC EOB marker is absent pos=69
     Last message repeated 6 times
 frame=  875 fps=582 q=2.0 size=    7409kB time=00:00:29.19
 bitrate=2078.8kbits/s
 frame= 1662 fps=553 q=2.0 size=   20069kB time=00:00:55.45
 bitrate=2964.7kbits/s
 error.dv: Input/output error
 frame= 1799 fps=546 q=2.0 Lsize=   23842kB time=00:01:00.02
 bitrate=3253.8kbits/s
 video:22347kB audio:1399kB subtitle:0 global headers:0kB muxing overhead
 0.406532%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2340>
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