[FFmpeg-trac] #726(undetermined:new): support for copying SMPTE 436M caption tracks

FFmpeg trac at avcodec.org
Fri Dec 9 16:13:01 CET 2011


#726: support for copying SMPTE 436M caption tracks
-------------------------------------+-------------------------------------
             Reporter:  dericed      |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  wish
  undetermined                       |                  Version:  git-
             Keywords:               |  master
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
 This is a part 2 to http://ffmpeg.org/trac/ffmpeg/ticket/682.

 I'm working with media from XDCam discs which contain an MXF with mpeg2
 video, 8 pcm audio tracks, and a caption track using SMPTE 436M. I just
 need to cut these files given an in point and duration and copy all tracks
 to a new file (using -map 0 -c copy).

 For XDCam MXF files the caption track is not recognized:
 {{{
 [mxf @ 0x101893800] track 9: could not find essence container ul, codec
 not currently supported in container
 }}}
 and subsequently the copy fails with
 {{{
 Could not write header for output file #0 (incorrect codec parameters ?)
 }}}
 I need the preserve the captions but would also like to use ffmpeg to this
 task.

 Full output (first 5MB of a sample attached):
 {{{
 ffmpeg -ss 300 -t 30 -i ELCO0378.mxf -map 0 -c copy trimmed.mxf
 ffmpeg version N-31468-g31c55c5, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Dec  8 2011 08:46:52 with gcc 4.2.1 (Apple Inc. build 5666)
 (dot 3)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared
 --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables
 --cc=/usr/bin/gcc-4.2 --enable-libx264 --enable-libfaac --enable-
 libmp3lame --enable-libtheora --enable-libvorbis --enable-libvpx --enable-
 libxvid --disable-ffplay
   libavutil    51. 30. 0 / 51. 30. 0
   libavcodec   53. 41. 2 / 53. 41. 2
   libavformat  53. 24. 0 / 53. 24. 0
   libavdevice  53.  4. 0 / 53.  4. 0
   libavfilter   2. 51. 0 /  2. 51. 0
   libswscale    2.  1. 0 /  2.  1. 0
   libpostproc  51.  2. 0 / 51.  2. 0
 [mxf @ 0x10180f200] could not resolve sub descriptor strong ref
 [mxf @ 0x10180f200] source track 11: stream 9, no descriptor found
 Input #0, mxf, from 'ELCO0378.mxf':
   Duration: 00:28:50.89, start: 0.000000, bitrate: 60317 kb/s
     Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1920x1080 [SAR 1:1
 DAR 16:9], 50000 kb/s, 29.97 fps, 29.97 tbr, 29.97 tbn, 59.94 tbc
     Stream #0:1: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:2: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:3: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:4: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:5: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:6: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:7: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:8: Audio: pcm_s24le, 48000 Hz, 1 channels, s32, 1152 kb/s
     Stream #0:9: Data: none
 [mxf @ 0x101893800] track 9: could not find essence container ul, codec
 not currently supported in container
 Output #0, mxf, to 'trimmed.mxf':
   Metadata:
     encoder         : Lavf53.24.0
     Stream #0:0: Video: mpeg2video, yuv422p, 1920x1080 [SAR 1:1 DAR 16:9],
 q=2-31, 50000 kb/s, 29.97 fps, 29.97 tbn, 29.97 tbc
     Stream #0:1: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:2: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:3: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:4: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:5: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:6: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:7: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:8: Audio: pcm_s24le, 48000 Hz, 1 channels, 1152 kb/s
     Stream #0:9: Data: none
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
   Stream #0:2 -> #0:2 (copy)
   Stream #0:3 -> #0:3 (copy)
   Stream #0:4 -> #0:4 (copy)
   Stream #0:5 -> #0:5 (copy)
   Stream #0:6 -> #0:6 (copy)
   Stream #0:7 -> #0:7 (copy)
   Stream #0:8 -> #0:8 (copy)
   Stream #0:9 -> #0:9 (copy)
 Could not write header for output file #0 (incorrect codec parameters ?)

 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/726>
FFmpeg <http://ffmpeg.org>
FFmpeg issue tracker


More information about the FFmpeg-trac mailing list