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The fix, put the systemd service script in ~/.config/systemd/user/ and use systemctl --user enable. Not what I wanted, but it works & is a solution. Change the service script a little of course: [Unit] Description=Test VLC From Python Script After=graphical-session.target [Service] ExecStart=/us...

Here is the mmal_avcodec section from a good 4k file run taken when not using systemd: main debug: looking for video decoder module matching "any": 18 candidates mmal_codec debug: OpenDecoder: <<< (hevc/----)[----] 3840x2160 0/0=0/0 o:0 -> (----/----) 0x0 0/0 o:0 mmal_avcodec debug: MmalAv...

VLC LOG FILE --verbose=2 Only errors were mmal_avcodec errors at the bottom of the log file. main debug: VLC media player - 3.0.11 Vetinari main debug: Copyright © 1996-2020 the VideoLAN team main debug: revision 3.0.11-0-gdc0c5ced72 .... main debug: `file:///home/media/BigBuckBunny_HEVC-1.mp4' give...

Check the logs. Probably it can't find the session bus.

Thanks Rémi for pointing me in the right direction with your response. Now to figure out the 4K issue.

OK, this is weird. I have been battling this all day & have been unsuccessful as of yet. I am working on a project that is Python based. The project is started via systemd scripts. Weird thing is vlc/cvlc works to an extent, it will run a 1080 vid just fine but not 4K. If I run the python app fr...