[FFmpeg-trac] #7965(avcodec:open): Support for HEVC with Alpha

[FFmpeg]

#7965: Support for HEVC with Alpha
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             Reporter:  leemartin    |                    Owner:  (none)
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  hevc         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Igor):

 Replying to [comment:14 logiclrd]:
 > I have found the following sequence which //seems// to produce an MP4
 file with HEVC with alpha content, but I am not on a Mac and have found no
 way to test it because the decoding support described by this ticket is
 not yet implemented. :-)
 >
 > {{{
 > x265 --input-res 606x692 --fps 30000/1001 --alpha --crf 20 Zap.yuva420p
 Zap.hevc
 > mkvmerge Zap.hevc -o Zap.mkv
 > ffmpeg -itsscale 0.3336666666 -i Zap.mkv -c copy -vtag hvc1 Zap.mp4 -y
 > }}}
 >
 I also tried using `x265` cli to encode separately into `*.hevc` and then
 package into mp4, but the result is equal to using `ffmpeg` directly.

 I see you use `mkvmerge`, why this interim step is needed?
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/7965#comment:16>
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