[Bug 274591] multimedia/ffmpeg package lacks intel quicksync / qsv / hardware encoding support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274591

--- Comment #1 from Jan Beich <jbeich@FreeBSD.org> ---
(In reply to qmr from comment #0)
> ffmpeg installed with pkg command lacks support for intel qsv / quick sync / hardware encoding

QSV codecs are exposed via MFX and VPL port options. Most system-wide ffmpeg
consumers use VAAPI instead.

MFX depends on libva-intel-media-driver, cmrtlib, intel-media-sdk which are
out-of-date, unmaintained and require many non-upstreamed patches.

VPL isn't very useful as it calls into MFX on legacy GPUs while
https://github.com/oneapi-src/oneVPL-intel-gpu hasn't been ported.

> This is widely used for programs like handbrake, jellyfin, emby, plex, shotcut, kdenlive, and other video editors.

Looking at the code in ports/:
- handbrake bundles ffmpeg built with qsv via --enable-libvpl
- jellyfin uses vaapi instead of qsv
- embyserver bundles ffmpeg built with qsv via --enable-libmfx
- plexmediaserver bundles ffmpeg built with vaapi but not qsv
- shotcut supports both vaapi and qsv
- kdenlive supports both vaapi and qsv

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