NO. There is no way to change the priority of video over audio. In computer standards, audio is presumed to be a higher priority because your ears will hear a defect before your eyes would see it.
This isn't just a fact of Catalyst. It's true at the root level of any computer or digital playback device. Trust me though, this is a good thing because there are all kinds of hidden things 99% of people aren't aware of that need this.