im comverting avi to dvd.
just a question on the last option in the advanced settings. can't seem to find a thread on the ac3 or mp4 option.

all i found was on the ac3. but still not sure. i think the avi file doesn't have ac3 so do i still check it?

and i  don't know if i should also check the mp4 option.

sorry if this might be a redundant question.