convert multiple mp4's into one ?

iMovie should be able to do it for you. Import your .mp4 files into iMovie first. Then make a new project, drag your files to the timeline back-to-back and then Share the movie the way you want to save it.

I use SimpleMovieX to merge vide files with no problems.

http://simplemoviex.com

Tech198 said:

Ideally, a better way would be automatically convert and make one mp4 file from 7 segments without user intervention

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If you have a Mac then you likely already have iMovie. It is very easy to combine clips in iMovie as that is what it was designed to do.

But if you want automation with no point and clicking then look at FFmpeg. This is the engine that Handbrake uses but it is available by itself. It will do what you want and runs on the terminal window. Look here www.ffmpeg.org

One trick that saves a LOT of typing is if you drag and drop a file from a finder window into terminal it types in the name of the file for you. It is otherwise nearly impossible to type this without a mistake. Drag and drop makes it fast.