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mac-videotoolbox: Add HEVC encoders (hw+sw)

1

### Description Add support for HEVC (in addition to the existing AVC) for mac-videotoolbox. ### Motivation and Context MacOS videotoolbox plugin should allow HEVC encoding.  ### How Has This...


TODO: move get and put from (scm ff) into olvm itself.

2

For speedup reason implement get and put from (scm ff) in C and include into olvm itself.

Subj. Useful links: - https://scheme.fail/ - https://youtu.be/pf4VbP5q3P0?t=194 - https://[hyper.dev](https://hyper.dev/n/flow/)/n/flow/ - https://github.com/amirouche/hyper.dev/blob/master/p/arew/untangle.scm ([Amirouche](https://twitter.com/_amiruc_))

TODO: implement "seccomp" for BSD

1

Implement the seccomp mode for freebsd. For details please go to https://web.archive.org/web/20160311162015/http://www.links.org/?p=1242

obs-ffmpeg: Add HDR and HEVC to VA-API encoder

5

### Description Add HEVC support to create HDR videos using FFmpeg VA-API on Linux. EDIT (jpark37): I have reworked the changes to add NV12 back to support narrow SDR again....