I'm trying to join 2 videos (MP4's) into 1 file. The picture comes out fine, but the sound is out of sync with it. I am only interested in MP4 (no other format). Is there some way of adjusting the sound sync after joining the two files? Or is there something I should be doing when setting the files up to be joined? Thanks for your help.
Try Avidemux 2.6 (http://avidemux.org/nightly) for MP4 (h.264/aac) files.