Playback deadlock
During playback, it seems that if the user asks for the next playback item it deadlocks.
Reproducible with Life_of_ Pi_draft_Ultra-HD_HDR.mp4
which you can find on Quincy: smb://Quincy._smb._tcp.local/Public/Samples/samples/HDR/Life_of_ Pi_draft_Ultra-HD_HDR.mp4
Backtrace: