I am fairly new to encoding DVD's for my ATV2 and am just using the "Apple TV" preset in Handbrake as I haven't had any issues in doing so. When I go to use Subler with my .m4v file I am stumped on why only the Video Track and Stereo AAC track are checked off and not the Surround AC-3 track that most people would want to use for their ATV2. I guess what I'm looking for is what do the check boxes actually mean in simple terms and will ATV2 still use the AC-3 track with it not being checked and what does it affect by checking both Stereo and Surround as I haven't seen anything by doing that but I am just doing basic tagging so maybe it is in fact the wrong thing to do but I am just too new to see what it affected. Also if I use the nightly builds of Handbrake like a lot of people recommend I see people use the ATV2 preset instead of the "Apple TV" one and am wondering if it is a better picture and how different in size the files are between the two. Thanks for the help in better understanding these awesome tools.