[FFmpeg-trac] #668(avcodec:new): Encoding RGB huffyuv looses the alpha channel

[FFmpeg]

#668: Encoding RGB huffyuv looses the alpha channel
-------------------------------------+-------------------------------------
               Reporter:  cehoyos    |                  Owner:
                   Type:  defect     |                 Status:  new
               Priority:  normal     |              Component:  avcodec
                Version:  git-       |               Keywords:  huffyuv
  master                             |  alpha
             Blocked By:             |               Blocking:
Reproduced by developer:  0          |  Analyzed by developer:  0
-------------------------------------+-------------------------------------
 http://samples.mplayerhq.hu/V-codecs/HuffYUV/camera2_hfyu32.avi contains a
 (useful) alpha channel that is decoded correctly by FFmpeg.
 Re-encoding the file to huffyuv (or ffvhuff) looses the alpha channel.

 {{{
 $ ffmpeg -i camera2_hfyu32.avi -vcodec huffyuv out.avi
 ffmpeg version N-34971-gfca85ce, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Nov 19 2011 00:44:40 with gcc 4.3.2 [gcc-4_3-branch revision
 141291]
   configuration:
   libavutil    51. 26. 0 / 51. 26. 0
   libavcodec   53. 35. 0 / 53. 35. 0
   libavformat  53. 20. 0 / 53. 20. 0
   libavdevice  53.  4. 0 / 53.  4. 0
   libavfilter   2. 49. 0 /  2. 49. 0
   libswscale    2.  1. 0 /  2.  1. 0
 [avi @ 0x8e16a80] parser not found for codec huffyuv, packets or times may
 be invalid.
 Input #0, avi, from 'camera2_hfyu32.avi':
   Duration: 00:00:01.20, start: 0.000000, bitrate: 73500 kb/s
     Stream #0:0: Video: huffyuv (HFYU / 0x55594648), bgra, 512x512, 25
 tbr, 25 tbn, 25 tbc
 [buffer @ 0x8e1e960] w:512 h:512 pixfmt:bgra tb:1/1000000 sar:0/1
 sws_param:
 [huffyuv @ 0x8e1e2e0] using huffyuv 2.2.0 or newer interlacing flag
 Output #0, avi, to 'out.avi':
   Metadata:
     ISFT            : Lavf53.20.0
     Stream #0:0: Video: huffyuv (HFYU / 0x55594648), bgra, 512x512,
 q=2-31, 200 kb/s, 25 tbn, 25 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (huffyuv -> huffyuv)
 Press [q] to stop, [?] for help
 frame=   30 fps=  0 q=0.0 Lsize=   10155kB time=00:00:01.20
 bitrate=69327.1kbits/s
 video:10149kB audio:0kB global headers:0kB muxing overhead 0.061582%
 }}}

-- 
Ticket URL: <http://www.avcodec.org/trac/ffmpeg/ticket/668>
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