In May 2019 Apple released and implemented a proposal for alpha channel support (so called transparent videos/movies) encoded in HEVC. Currently, it seems only Apple tools (avconvert and Compressor) support this format. ffmpeg with the current libx265 fails while encoding as it does not support a pixel format with alpha support (ffmpeg relevant ticket https://trac.ffmpeg.org/ticket/7965 ).

Is it planned or has it been evaluated providing support for videos with alpha? Or is it something that can already be accomplished with command line flags?

https://bitbucket.org/multicoreware/x265_git/issues/attachments/577/multicoreware/x265_git/1604508977.83/577/HEVC-Video-with-Alpha-Interoperability-Profile.pdf
Support for alpha/transparency per apple interoperability proposal
This is a GitHub Issue
repo:libde265
owner:strukturag
Title : Support for alpha/transparency per apple interoperability proposal
Issue date:

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In May 2019 Apple released and implemented a proposal for alpha channel support (so called transparent videos/movies) encoded in HEVC. Currently, it seems only Apple tools (avconvert and Compressor) support this format. ffmpeg with the current libx265 fails while encoding as it does not support a pixel format with alpha support (ffmpeg relevant ticket https://trac.ffmpeg.org/ticket/7965 ).

Is it planned or has it been evaluated providing support for videos with alpha? Or is it something that can already be accomplished with command line flags?

https://bitbucket.org/multicoreware/x265_git/issues/attachments/577/multicoreware/x265_git/1604508977.83/577/HEVC-Video-with-Alpha-Interoperability-Profile.pdf
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