[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:1 cehoyos]:
 > 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.)

 I would like to generate a sample with alpha, but I do not match the specs
 for example for Adobe Premiere CS6 which I could use for it:

 http://helpx.adobe.com/x-productkb/policy-pricing/system-requirements-
 premiere-pro.html#Adobe%20Premiere%20Pro%20CS6%20system%20requirements

 If you meet then maybe you can use this instruction to generate a file:

 http://forums.creativecow.net/thread/3/934149

 http://www.matrox.com/video/en/support/windows/vfw_software_codecs/downloads/softwares/version1.0/build33/

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2616#comment:3>
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