Commented out mp4 profiles from usage. They just don't work well yet.

There is a lot more work required to get that encoding to use 6 channel audio properly.
The 2-channel audio is also not very impressive. Tried using -oac copy to copy the AC3
stream from the DVD, and it didn't work either. So, it's not ready for prime time use.
Once it is, I will uncomment it from the usage then.