Originally Posted by NewMexican505
I had these same problems and what worked for me was to change Audio Output from "Digital Out" to "System Sound Output" in the menu bar up top. I hope it helps others.
Thanks for this suggestion. It certainly nailed down what my problem was.
I am running a MacBook Pro (2010) connected to my LCD Television. The Television passes through the Encoded Audio through via a Optical Out on the TV.
Everything was running fine until I upgraded to Mountain Lion (I just KNEW it was not going to be seamless...)
The only way I can get Dolby Digital sound to the Denon receiver is by using "Digital Out" in Eye TV (3.5.6). Any other output yields a 2 channel signal through the HDMI (Mini Display adapter). I was getting the stuttering on both live TV and recordings. Oddly enough, when I would export to iTunes, those recordings were perfect (except those recordings don't have 5.1 audio).
When playing a .eyetv file via the EyeTV interface, there's always stuttering. However, I can open the .eyetv package, and play the .mpeg file directly using VLC (with encoded audio output) and the video is fine.
I think this nails it down to the way EyeTV outputs "encoded audio" (at least in Mountain Lion). Lion was fine. I've played around with the Audio Midi settings in Utilities along with the audio tab in System Preferences. For whatever reason, the combination of EyeTV+Mini Display HDMI adapter+Mountain Lion doesn't work well.
I hope this helps someone.