Audio question

Hi, I wanted to know about ac3-2ch and dolby 5.1, i always choose 5.1 for my movies and uncheck everything else in dvdshrink, i have surround sound ,is this the right thing to do by un checking ac3 2-ch to save space.

Yep that’s what to do.

I don’t have surround sound but I always only keep the 5.1 audio.