Hello all, New to these forums, any help would be appreciated... I am looking for an application (Windows based preferably) that can add a second audio track to my mp4's that only have 5.1 AC3. I recently converted all of my .mkv rips to .mp4's to be used with my AppleTV 2, and although everything works great in this regard, I would like to be able to use these files on my iPhone and soon to be acquired iPad 3. Is there any application that will help me do this without having to run everything through Handbrake? I have no need to change the video, and want to keep the 5.1 AC3... I would just like to add a second 2 channel aac track so these movies will work on my other i devices... Please let me know if I am not in the correct sub-forum.