[FFmpeg-trac] #3622(avformat:reopened): Second audio track in mov sometimes marked as default

FFmpeg trac at avcodec.org
Mon Jul 21 14:18:20 CEST 2014


#3622: Second audio track in mov sometimes marked as default
-------------------------------------+-------------------------------------
             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  reopened
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mov          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by outlyer):

 Replying to [comment:11 michael]:
 > Replying to [comment:10 cehoyos]:
 > > The issue is still reproducible with current FFmpeg git head:
 >
 > can you explain in which way it is insufficient ? / what did QT do ?

 When a file is played by QuickTime on a desktop, both audio tracks play
 simultaneously; on an AppleTV, the AC-3 track is ignored and cannot be
 played - only the AAC track is usable.

 Both audio tracks are visible when ffprobe is used, but having multiple
 default audio streams causes the problem.

 ==  Broken (Unplayable AC-3) ==
 {{{
    Metadata:
       handler_name    : VideoHandler
     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo,
 fltp, 256 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
     Stream #0:2(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side),
 fltp, 384 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
     Stream #0:3(eng): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s
 (default)
     Metadata:
       handler_name    : SubtitleHandler
     Stream #0:4: Video: mjpeg, yuvj444p(pc), 600x600 [SAR 72:72 DAR 1:1],
 90k tbr, 90k tbn, 90k tbc
 }}}

 == Playable (Working dual-audio) ==

 {{{
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo,
 fltp, 256 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
     Stream #0:2(eng): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side),
 fltp, 384 kb/s
     Metadata:
       handler_name    : SoundHandler
     Stream #0:3(eng): Subtitle: mov_text (tx3g / 0x67337874), 0 kb/s
 (default)
     Metadata:
       handler_name    : SubtitleHandler
     Stream #0:4: Video: mjpeg, yuvj444p(pc), 600x600 [SAR 72:72 DAR 1:1],
 90k tbr, 90k tbn, 90k tbc
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3622#comment:12>
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