> 1080P MKV files play on Mplayer (albiet a little slow). Whern the new
> video drivers come out playback should be adequate.

I doubt that the new video drivers are going to change that. On MorphOS it's the CPU that's decoding A/V and syncing them. To be able to properly view 1080p content on a G4 based system we'd need drivers that use the GPU to decode the video stream.

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7383&forum=11