A bit late, but having the same problems
Even LAV 59.1 doesn't fix the problem.
Playing from the webbrowser (chrome) audio works fine, only Only-Videos seems to be affected, strange...
This is a known issue and has been reported a lot of times allready.. AFAIK it is because of the bitrate of the audio that is included in the stream. Sometimes there are more different streams. You have to select a stream with a lower bitrate audio. (The value behind the resolution)