Thanks, Now I may have a glimpse of what is happening.
I see you are using upsteam mpv and ffmpeg without any further modifications.
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With the shipped mpv.dll playback is working right?
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Can you please test a version my mpv builds?
Dolby TrueHD passthrough - modified mpv build - #149 by Mitzsch
They also feature a ffmpeg plex network specific patch… Maybe that one is needed now with the newest version of Plex HTPC (the changelog says something about localhost behavior…)