id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed
1033,MOV file with non-zero/negative start has no sync between A/V unless -async 1 is used,faroutliving,,"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
",defect,open,normal,undetermined,git-master,,mov async,,,,1,0