[FFmpeg-trac] #3415(undetermined:new): when remux tscc avi to mkv, the mkv can not be displayed

[FFmpeg]

#3415: when remux tscc avi to mkv, the mkv can not be displayed
-------------------------------------+-------------------------------------
             Reporter:  chinshou     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 when remux tscc avi to mkv, the mkv can not be displayed

 How to reproduce:
 {{{
 % ffmpeg -i xxx.avi -codec copy xxx.mkv

 % ffplay xxx.mkv

   libavutil      52. 48.100 / 52. 48.100
   libavcodec     55. 39.100 / 55. 39.100
   libavformat    55. 19.104 / 55. 19.104
   libavdevice    55.  5.100 / 55.  5.100
   libavfilter     3. 90.100 /  3. 90.100
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 [camtasia @ 0049DD00] Camtasia error: unknown depth 0 bpp0B f=0/0
     Last message repeated 1 times
 Input #0, matroska,webm, from 'xxx.mkv':
   Metadata:
     ARTIST          : ﾐｻﾁ德ｺ｡｢ﾂｳﾁｦ
     ISBJ            : Altium Designerﾔｭﾀ楨ｼﾓ・CBﾉ
     COPYRIGHT       : ｵ釋ﾓｹ､ﾒｵ
     ENCODER         : Lavf55.19.104
   Duration: 00:05:39.67, start: 0.000000, bitrate: 690 kb/s
     Stream #0:0: Video: tscc (tscc / 0x63637374), 1280x772, SAR 1:1 DAR
 320:193,
  15 fps, 15 tbr, 1k tbn, 1k tbc (default)
     Stream #0:1: Audio: pcm_s16le, 22050 Hz, 1 channels, s16, 352 kb/s
 (default)

 [camtasia @ 0049DD00] Camtasia error: unknown depth 0 bpp
    2.43 M-A:  0.000 fd=   0 aq=   11KB vq=    0KB sq=    0B f=0/0
 }}}

 The error message come from
 {{{
     switch(avctx->bits_per_coded_sample){
     case  8: avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
     case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
     case 24:
              avctx->pix_fmt = AV_PIX_FMT_BGR24;
              break;
     case 32: avctx->pix_fmt = AV_PIX_FMT_RGB32; break;
     default: av_log(avctx, AV_LOG_ERROR, "Camtasia error: unknown depth %i
 bpp\n", avctx->bits_per_coded_sample);
              return AVERROR_PATCHWELCOME;
     }
 }}}

 I check the matroskaenc.c and matroskadec.c , mkv muxer does not write the
 bits_per_coded_sample information for video track , it only write similar
 information as MATROSKA_ID_AUDIOBITDEPTH for audio track.


 avidec.yuv will call ff_get_bmp_header to parse bitmap header to get the
 bits_per_coded_sample information from video stream.

 mkv demuxer also does not do such work. Is it a bug of mkv demuxer or
 muxer? Is it possible to support RGB Pixel format video stream in mkv
 container? If possible , what should we do to support such feature?

 best regards

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3415>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker