i have 2 parts of a movie converted, both mp4's and would like to join them to a single file. i have quicktime pro, but it seems when i combine the 2 files i have the option of saving as a .mov, which won't allow proper metadata info for itunes. i have tried to export as mp4 but the "pass through" option is not available for some reason. i obviously dont want to reconvert it, just join the 2 existing files. i also tried visual hub using the pass-through option and "stich videos together", but it got stuck when combining the 2 videos. seems like a relatively simple thing to do.. is there a program that will do this for me? or can it be done through terminal even?