https://bugs.kde.org/show_bug.cgi?id=456482

--- Comment #7 from Nick Korotysh <tevut...@mail.ru> ---
small update: occasionally found another `libmpv`-based player called Celluloid
and decided to try. and hardware decoding (using `vaapi`) works in it, no
difference in CPU/GPU load comparing with SMPlayer using the same test video.

sources of mentioned player can be found here
https://github.com/celluloid-player/celluloid , it is GTK-based.
its configuration dialog is very simple, but have very convenient field "Extra
MPV options", where I supplied the most important options copied from SMPlayer
mpv command line `hwdec=vaapi vo=gpu sub-auto=fuzzy icc-profile-auto
audio-file-auto=fuzzy` (just removed '--' like it was in some example I found).

regardless of this field, comparing to SMPlayer, this player doesn't run `mpv`
executable (checked with `ps ax | grep mpv`) and it is definitely linked to
`libmpv` (checked with `ldd /usr/bin/celluloid | grep mpv`). don't know how,
but it passes given options to some `libmpv` internals...

so, the problem with H/W decoding somewhere on application side...

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