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

[FFmpeg]

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

 As noted on IRC, the preferred path for decoding alpha in HEVC is to look
 at how the MV-HEVC work has enabled `nuh_layer_id` >0 handling, and
 extending the native HEVC decoder in such manner (there should be a SEI
 message describing the layer as alpha layer, and then a separate video
 stream contained in packets marked with that layer).

 For encoding it would currently indeed be one of the external encoders
 whose wrapper would have to be extended as there is no internal encoder
 for HEVC.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11331#comment:3>
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