Rainer Hochecker

> Might be that PVR data is fetched in the background causing CPU spikes. Exactly this. This also causes slight but noticeable stuttering in video when PVR is active. I...

> why isn't my receiver changing audio channels? For what reason should it change channels?

You are mixing up serval issues.

@CastagnaIT check out https://github.com/xbmc/xbmc/pull/5312

> cannot be indipendent the subtitle buffering from a/v? In general a video stream is comprised of video, audio, and subtitle streams. After demuxer the packets are progressively buffered by...

Moving packet selection https://github.com/xbmc/xbmc/blob/master/xbmc/cores/VideoPlayer/VideoPlayer.cpp#L1611 to the stream players would solve the issue. EDIT: updated link https://github.com/xbmc/xbmc/blob/Matrix/xbmc/cores/VideoPlayer/VideoPlayer.cpp#L1611

> @FernetMenta : Please comment. Did I put it in the right location? I don't get your question.

I don't think this is correct. If the new subtitle comes from the same source, resetting the delay makes no sense.

Sacrificing a valid scenario on favour of another one just because it seems more likely is a bad approach. The current behaviour is works as designed. I agree with @lrusak...

Please post full debug log. I can't even see you system spec.