Twitch stream is either jittery or un-watch-able

Put the summary of the bug you're having here

What I expected to happen was...:
You know, just streaming and people being able to watch me play minecraft.

What actually happened was...:
Stream keeps studdering/jittering, stream is completely black, or is only one color.

Steps to Reproduce:
1. Stream from a mac on OSX 10.9
2. Have a video preview open while streaming
3. http://prntscr.com/2604j6 http://www.twitch.tv/gamerguy500/c/3283752 <- Those will happen or the screen (of the stream) will just be blank!