Hi Fabrice!
Does the file '/mnt/media/TV Shows (en)/Seinfeld (1989)/Season 3/Seinfeld.S03E19.The.Limo.720p.WEBrip.AAC.EN-SUB.x264-[MULVAcoded].mkv' play for you correctly every time you start it not via playlist?
From the logs I see that VAAPI on Intel integrated video (I suppose it is an integrated video) starts spewing 'COutput:StateMachine' errors.
I am going to forward the bug to upstream and ask FernetMenta or ksooo about that StateMachine state. In my experience, these errors originate either from buffer jitter or from improperly-encoded mediafile.
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Vasyl Gello