I’m not familiar with either of those programs, sorry.
You might want to check what mpv and/or va-api is reporting.

Do you have any specific issues?
I’ve been using a 9070 on fedora (42 initially, 43 for a few days) and hw acceleration hasn’t been an issue. I’ve been using newer mesa drivers from a copr repo FWIW, but I don’t think hw acceleration was any issue before that.