@mewmew that is what I did I think... for a while I was getting CORS errors but that seems to have been fixed. Now in Safari (and Chrome I think) videos play for like a second and then I get a loading spinner (but I can see the video downloading in network requests and on the playback bar)... and in Firefox playback just doesn't start at all for seemingly no reason.

Thinking it is a transcoding issue now, still looking into it.