ive noticed that some movies skip or freez if i keep DTS,whats up with that is it doesnt like to keep both or just the DTS? also noticed that the animorphic widescreen doesnt work in movie only copy its a real narrow widescreen when DTS is kept hmmm
dts is an audio file. honestly it is the best but most people dont have a systemthat utilizes it, so just keep the 5.1 and ur be all gravy. also get rid of the other crap like subtritiles u dont need, which will allow for less compression. i only keep the movie and 5.1 thus i rarely have to compress.
AC 3 is ur standard 2 channel audio (i think). dont know about the okb dolby digital. i never had that issue with shrink.