I’m using Connect, which is usable, I suppose, but it’s not great, IMO. Links to other instances don’t really work that great, as it interprets them as users.

Will come back here when/if the links are fixed.

I have a personal Jellyfin server, and I usually reencode from x264 to AV1. Though if it’s a matter of choosing a source, I always go for x264 for the least compression.