2 examples for MP4Box

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  # Install (Debian and derivatives)
sudo apt-get install gpac

# Losslessly concatenate MP4 videos from '0.mp4' to '3.mp4'. All of them must have the same resolution.
MP4Box -cat "0.mp4" -cat "1.mp4" -cat "2.mp4" -cat "3.mp4" losslessly-concatenated.mp4
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  # Losslessly split a playable MP4 video file specifying times in seconds. This creates a copy of the minute 1'50" until 3'.
MP4Box example.mp4 -splitx 90:180