You can merge videos using “MPEG Streamclip,” a free video editing software available for Mac.

・Squared 5 - MPEG Streamclip video converter for Mac and Windows

Video Merging Method

1. Select multiple video files and drag and drop them onto the launched screen
2. Confirm that the time at the bottom of the screen shows the total time of all files
3. Go to File → Save as to merge and save in the original file format!

It’s convenient because it quickly joins videos together.

However, if the video sizes are different, they cannot be merged, so in such cases, you need to edit the videos using software like iMovie.

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Reference Information

・mpeg4(H.264)動画の結合: macな日々

That’s all from the Gemba.