[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 alpha  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Changes (by cehoyos):

 * keywords:   => matrox alpha
 * status:  new => open
 * version:  unspecified => git-master
 * component:  undetermined => avcodec


Comment:

 Assuming "alpha codec" means that the encoder can really save transparency
 information in the mpeg2 video stream, could you try to encode a file that
 actually contains transparency?
 As for example the files in http://samples.ffmpeg.org/FLV/flash_with_alpha
 (There are other samples but I can't find them atm.)

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2616#comment:1>
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