[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:19 James]:
 > The file seems to have all the required parameter sets and alpha layer
 slices, so the only thing it's missing is the hvc1 tag. Use {{{-tag:v
 hvc1}}} for the output.
 >
 > You can also remove the custom alpha=1 x265-param as the library will
 detect the pixel format you're passing to it has an alpha plane.
 Appreciate your effort to look into the file, adding a tag indeed did the
 trick!

 So, for the folks, that are looking for a solution, here what I used:
 {{{
 ffmpeg -vcodec libvpx-vp9 -i input.webm -c:v libx265 -tag:v hvc1
 output.mp4
 }}}

 Please mind that I compiled both `ffmpeg` and `x265` from the upstream.
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Ticket URL: <https://trac.ffmpeg.org/ticket/7965#comment:20>
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