Thanks for your suggestion with checking the Batch Process Control.
It seems that the source media file is corrupt.
If I start a trace I got the following error:
video errors: 1105#Product invalid duration - product(1150 sec), source(95 sec).
audio errors: 1105#Product invalid duration - product(1150 sec), source(95 sec).
I did open the vob file with VLC media player and the duration showed 95 seconds instead of 18minutes!
I did recheck the source video file with a media info tool.
Because of that we have to recheck some media source files, and I think kaltura itself seems to be fine.
Just one thing! While I was checking the logfiles I've discovered thousands of such files and that kaltura consumed plenty of gigs of free space. Is there a way or setting that kaltura automatically delete this logfiles from time to time?
Thanks and kind regards,