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Re:Mpv – A free, open source, and cross-platform media player by xfalcox on Monday July 18, 2022 @01:25PM (#32140814)
Pair it with GPU acceleration for smooth and low CPU overhead playback for livestreams:

    mpv -vo=gpu --hwdec=vaapi --gpu-context=wayland  https://www.twitch.tv/gorgc
Re:Mpv – A free, open source, and cross-platform media player by 5e92cb50239222b on Monday July 18, 2022 @02:19PM (#32141531)
Shove that into ~/.config/mpv/mpv.conf (each parameter on its own line and without the dash prefix) if you don't want to repeat yourself over and over again.
Re:Mpv – A free, open source, and cross-platform media player by joveian on Tuesday July 19, 2022 @06:01AM (#32149496)
For some reason hwdec doesn't seem to make much difference for me in terms of power or CPU usage. Also worth mentioning is profile=gpu-hq (can just uncomment in the example config).