How about OpenH264[1]? It's not preinstalled and it's not clear whether it works for generic video (I think it does), but it might be useful in Firefox.
Granted, I would love if hardware video acceleration for some of the free codecs like AV1 would be more widely available.
I guess if the user install, it should be able to play (haven't tried). But, because this would require extra steps, I preferred to just have the ST + VP9 to Firefox. In future versions, I could give an options page where the user can adjust this.
Granted, I would love if hardware video acceleration for some of the free codecs like AV1 would be more widely available.
[1] https://blog.mozilla.org/en/mozilla/video-interoperability-o...