Pretty much everything except the browsers.

I use several video players, including mpv, vlc and ffmpeg, and they have always used without problems the hardware video decoding and encoding on all kinds of GPUs.

Only with Firefox and Chrome/Chromium in most versions the hardware acceleration is broken, even if there have been some versions where it worked fine (on NVIDIA), but at the next browser upgrade it was broken again.

This does not bother me much, because I do not like to watch video files in a browser anyway. I always download them first and I play them locally.

Ah, OK. Then we are on the same page.

Sadly enough, I need the browsers to use hw-assisted en/decoding for my video communication... Which seems to be little more than a dream, ATM.