For me, the only thing wrong with the new video player and my first generation NVIDIA shield and first gen controller is that they have totally borked to controls. “B” no longer goes back during playback and the triggers no longer skip and instead they use the shoulder buttons. I’d like o see this fixed or have a controller configuration/remapping in some way please.
Despite totally ruining the controller mapping I found the new video player otherwise pleasurable and enjoyed the added metadata in the playback UI for instance.
@radind I would guess it depends on your device but for me it was in: Settings —> Advanced —> Enable new video player. HTH!
EDIT: Two things wrong for me: This useful overlay metadata no longer shows up 
see this other thread: New Player Removes Information Overlay
