a note from pedant's corner
MP4, MOV and FLV are container formats, not encoder formats. You can put any kind of video into them. I made some DNxHD .MOV files just yesterday, for example, which I very much doubt most media players on any OS would play back.
While it doesn't surprise me that the lay person gets these kind of things mixed up, I would hope that the author of an app which actually encodes video would know the difference.
That aside, this is actually a rather good app.