[FFmpeg-trac] #3707(avcodec:new): Support decoding transparency information in dnxhd streams

[FFmpeg]

#3707: Support decoding transparency information in dnxhd streams
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:             |                 Status:  new
  enhancement                        |              Component:  avcodec
               Priority:  wish       |               Keywords:  dnxhd alpha
                Version:  git-       |               Blocking:
  master                             |  Analyzed by developer:  0
             Blocked By:             |
Reproduced by developer:  0          |
-------------------------------------+-------------------------------------
 http://thread.gmane.org/gmane.comp.video.ffmpeg.libav.user/13205

 A user uploaded a dnxhd sample that contains transparency information (the
 black background is supposed to be transparent), FFmpeg reports
 yuv422p10le.
 {{{
 $ ffmpeg -i Untitled_dnhd.mov
 ffmpeg version N-63852-gf341340 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Jun  9 2014 16:59:00 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 89.100 / 52. 89.100
   libavcodec     55. 66.100 / 55. 66.100
   libavformat    55. 42.101 / 55. 42.101
   libavdevice    55. 13.101 / 55. 13.101
   libavfilter     4.  7.100 /  4.  7.100
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Untitled_dnhd.mov':
   Metadata:
     major_brand     : qt
     minor_version   : 537199360
     compatible_brands: qt
     creation_time   : 2014-05-29 21:36:09
   Duration: 00:00:01.03, start: 0.000000, bitrate: 842317 kb/s
     Stream #0:0(eng): Video: dnxhd (AVdn / 0x6E645641), yuv422p10le,
 1920x1080, 841432 kb/s, 29.97 fps, 29.97 tbr, 1000k tbn, 1000k tbc
 (default)
     Metadata:
       creation_time   : 2014-05-29 21:36:09
       handler_name    : Apple Alias Data Handler
       encoder         : DNxHD  709
 At least one output file must be specified
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3707>
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