[popcornmix]

There is another problem for a long time. Frequent recourse to video files causes inhibition of OS. I mean, do start / stop some videos 6-10 times, then the sound disappears and everything starts working slow. Helps to restart.

Can you grab a log next time it happens. I have seen this error (with dvdplayer - not omxplayer):

Code:

23:25:16 T:8116   ERROR: ActiveAE::ActiveAE::CActiveAE::MakeStream - could not create stream
23:25:16 T:8116   ERROR: CDVDPlayerAudio::Process - failed to create audio renderer

And that does produce an effect like you've described (video starts without audio, but grinds to a halt after a number of seconds).

Looks like it's not a Pi specific error.
However I've not seen it in my dev environment and cannot make it fail on demand which is necessary to debug it.

If you identify a reliable way of provoking this error, that would be very useful. If you do, provide a debug log, sample file and explain any settings that are non-default.