Best Answer booblian , 29 October 2012 - 08:15 AM
Have just noticed exactly the same problem. Just happened today, similar circumstances, HDMI connected amp out of a mac mini and 5.1 sources play fine but 2 channel stereo material does not. I can hear the interface clicks also no problem.
I have not updated anything manually like system updates or plex updates in the last week. Running PMS 0.9.6.9.24 and the latest associated Plex mac client.
Similarly, 2-channel stuff audio plays in VLC just fine ... and videos with compatible codecs and 2-channel audio in quicktime just fine...
but not plex????
This happen spontaneously to anybody else's installation?
I'm the first to admit things like this are BKC errors [between chair and keyboard]... but I've touched nothing.
!! UPDATE: I appear to have fixed my issue and it may address the problem for you too. Here's what I found...
1. Play one of the currently silent movies/clip/episodes in plex.
2. During playback, hit 'M' on the keyboard and navigate over to the audio options [looks like a little speaker symbol], then select that
3. Check the Volume value. Mine had been set somehow to -48Db.
4. If that value is lower than 0.0Db, turn that thing up and see if that brings 2-channel stereo stuff back to normal.
good luck. Go to the full post