Using mpv made the difference, not Trixie.
It seems MPlayer has been brought back from the dead some time ago, but it's still got a few years of catching up to do. It's a mystery to me why you would want to use it (instead of mpv).
VLC (or gnome's video player) for some reason can't handle 720p or 'even' 1080p. I have a vague recollection that VLC hasn't moved to ffmpeg 5 yet (let alone 6 as used in Trixie).
And I'm quite sure that hardware acceleration is NOT working (unless you patched several things for that).
You'll likely see CPU usage on all cores of 80-100% as it does all things on the CPU, which means it's indeed not using HW-accel.
It seems MPlayer has been brought back from the dead some time ago, but it's still got a few years of catching up to do. It's a mystery to me why you would want to use it (instead of mpv).
VLC (or gnome's video player) for some reason can't handle 720p or 'even' 1080p. I have a vague recollection that VLC hasn't moved to ffmpeg 5 yet (let alone 6 as used in Trixie).
And I'm quite sure that hardware acceleration is NOT working (unless you patched several things for that).
You'll likely see CPU usage on all cores of 80-100% as it does all things on the CPU, which means it's indeed not using HW-accel.