How Can I Stitch Together Two Large mp4 Files?

I have two very large mp4 files (close to 1 GB each) and I need to join them together into one mp4 file. Is there a free program that will allow me to do that? I tried using iMovie but there wasn't enough room on my hard drive to create an iMovie project for it.

MPEG Streamclip in batch mode will allow you to do this for free. Just make sure they are named in order , e.g. A.avi, b.avi - drag to the batch list and select join files. You will have to reencode them to something like H264 to do this. Which is probably a good idea anyway vs. whatever mystery AVI codec is in use.
If they play in QT and you already have QT Pro, just open both, set the pointer on A to the end of the clip. Then for B select all (CMD+A), copy (CMD+C), then click on the player for A and do paste (CMD+V). "Save as" (new filename) will make a new MOV file without reencoding them.
The SimplemovieX author is supposed to say more than he is the author but that he gets compensation for his recommendations. Since he expects you to buy his software. Don't bother.

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