[FFmpeg-trac] #1033(undetermined:new): MOV file with non-zero/negative start has no sync between A/V

[FFmpeg]

#1033: MOV file with non-zero/negative start has no sync between A/V
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  faroutliving                       |                 Priority:  normal
               Status:  new          |                  Version:  git-
            Component:               |  master
  undetermined                       |               Blocked By:
             Keywords:               |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 I have a couple files which someone generated by loading the video into QT
 on the Mac and some how selecting an range and resaving. Not a QT user, so
 don't know how they did it. The resulting files play properly in QT and
 other apps, but when played with ffplay or reencoded to another format in
 ffmpeg, they are out of sync. In ffplay, the first frame holds for many
 seconds while the audio plays, and when the video does start it is behind
 the audio by the number of seconds it held the initial video. Converted
 files in ffmpeg have same/similar problems using commands like "ffmpeg -i
 bad_mov_start.mov -c:v libx264 -preset veryfast -qp 0 bad_mov_start.mp4".

 The smallest(!) file is 1.8Gb, and can be downloaded from a good server at
 http://www.usmediavault.com/bad_mov_start.mov

 Thanks for your great work! If this was something I could help fix (I have
 some small knowledge from writing a libavdevice) I would be willing to
 take a stab but knowing where to start and what the actual problem is
 would help. From my perspective, it is like a needle in a haystack! Just
 let me know if I can be of some use.

 ------------------

 ffmpeg -v 9 -loglevel 99 -i bad_mov_start.mov
 ffmpeg version N-38488-gf972193 Copyright (c) 2000-2012 the FFmpeg
 developers
   built on Mar  4 2012 00:22:11 with gcc 4.5.2
   configuration: --enable-shared --enable-gpl --enable-nonfree --enable-
 libxvid --enable-libx264 --enable-libmp3lame --enable-libvorbis --enable-
 libfaac --enable-librtmp --enable-libopenjpeg --enable-decklink
   libavutil      51. 41.100 / 51. 41.100
   libavcodec     54.  6.100 / 54.  6.100
   libavformat    54.  2.100 / 54.  2.100
   libavdevice    53.  4.100 / 53.  4.100
   libavfilter     2. 62.101 /  2. 62.101
   libswscale      2.  1.100 /  2.  1.100
   libswresample   0.  7.100 /  0.  7.100
   libpostproc    52.  0.100 / 52.  0.100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x23403a0] Format mov,mp4,m4a,3gp,3g2,mj2
 probed with size=2048 and score=100
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x23403a0] ISO: File Type Major Brand: qt
 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x23403a0] All info found
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bad_mov_start.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     creation_time   : 2012-02-27 01:30:20
   Duration: 00:01:33.31, start: -12.126126, bitrate: 149599 kb/s
     Stream #0:0(eng), 47, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, 1 channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:1(eng), 24, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, 1 channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:2(eng), 24, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, mono, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:3(eng), 24, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, 1 channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:4(eng), 24, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, 1 channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:5(eng), 24, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, 1 channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:6(eng), 24, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, 1 channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:7(eng), 24, 1/48000: Audio: pcm_s24le (in24 / 0x34326E69),
 48000 Hz, 1 channels, s32, 1152 kb/s
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:8(eng), 1, 1/2997: Video: prores (apcn / 0x6E637061),
 yuv422p10le, 1920x1080, 1/2997, 140357 kb/s, 29.97 fps, 29.97 tbr, 2997
 tbn, 2997 tbc
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
     Stream #0:9(eng), 1, 1/2997: Data: none (tmcd / 0x64636D74)
     Metadata:
       creation_time   : 2012-02-27 01:30:20
       handler_name    : ?Apple Alias Data Handler
       timecode        : 00:00:00:00
 At least one output file must be specified

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1033>
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