I don't know if this is the right place for this question or if this is more of a newbie one. I am trying to backup some new films I bought. I notice there is both a AC3 5.1 audio (I'm using DVD shrink) and a AC3 2 channel. Do I need the 2 channel for any reason? I'm having a hard time getting the films to fit on 1 disc without compressing them alot. Can I strip off this AC3 2 channel sound? Any other ideas to help shrink the film down in size? I am backing up film only (no extras). Thanks.