[FFmpeg-trac] #2616(avcodec:open): support matrox mpeg-2 I-frame with alpha codec (m704 fourcc)

[FFmpeg]

#2616: support matrox mpeg-2 I-frame with alpha codec (m704 fourcc)
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             Reporter:  ami_stuff    |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  matrox       |               Blocked By:
  mpeg2video alpha                   |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by ami_stuff):

 Replying to [comment:8 cehoyos]:
 > Does it support encoding png in avi? A user on irc claims that encoding
 transparency should work fine with VirtualDub (sorry, I honestly don't
 know).

 This is what VirtualDub supports:

 http://packtlib.packtpub.com/graphics/9781904811350/graphics/1353_08_15.jpg

 Maybe he can create a real alpha sample, I don't know how.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2616#comment:12>
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