[FFmpeg-trac] #11331(avcodec:closed): X265 HEVC Alpha transparency support

[FFmpeg]

#11331: X265 HEVC Alpha transparency support
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             Reporter:  Mista_D      |                    Owner:  (none)
                 Type:  sponsoring   |                   Status:  closed
  request                            |
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  alpha x265   |  needs_more_info
  hevc                               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Timo R.):

 Encoding support via libx265 and potentially nvenc might be available here
 now:
 https://github.com/BtbN/FFmpeg/tree/nvenc_hevc_alpha

 Currently there seems to be a driver bug that makes nvenc write incomplete
 alpha headers when in global headers mode.
 To work around that in a non-compliant, hacky way:
 https://github.com/BtbN/FFmpeg/tree/nvenc_hevc_alpha_hack

 I have not yet found a way to actually decode or test those files.
 Nothing seems to support decoding them. But on first glance they seem to
 be correct and spec compliant.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11331#comment:6>
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