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Thank you very much again for your help.
Hm, it's getting more difficult :-) I use LibreElec. Do I have to modify sytemd config files for that? How do I do that?
With hardware acceleration disabled, HD TV uses nearly 100% CPU load and playback is sometimes not flawlessly.

Best Regards
Ralf Jahns  

Yes - there is a posibility to do that. I pinged Milhouse on slack cause I have plain forgotten how to do that on LE :-)

Btw. HD is also mpeg-2 for you? Cause H264 should still work with VAAPI right?  

German public service broadcasting (governmental financed) TV stations encode HD with MPEG-4 (I think this is H264) and you are right, this still works with VAAPI. So it is possible to keep hardware acceleration for MPEG-4 switched on but meanwhile I did the setting you suggested to switch back to VDPAU.
Don't understand why all this is necessary. Is it a bug? Why is VAAPI enabled for my hardware if it doesn't work?

Best Regards
Ralf Jahns 

 Your hardware is old and VDPAU is deadend. Therefore VAAPI was implemented which your HW can do (on the paper). Btw. you got a command on how to switch back to VDPAU - please use that one and forget about VAAPI on your hardware.