I have an interim workaround which works well provided the video bitrate is < 90 Mbps.
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PMS 1.19.5 for QNAP now provides direct access to Preferences.xml in the “PlexData” share in File Station.
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Install / use PMSLibShare
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Using a Linux (not Windows) text editor (QNAP text editor is recommended), Add
VaapiDriver="i965"before the closing/>at the end ofPreferences.xml. Put a space before and after this setting.
It will appear as: VaapiDriver="i965" />