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MP4Box

MPEG-4 Systems Toolbox - Muxes streams into MP4 container

Display information about an existing MP4 file

MP4Box -info {{filename}}

Add an SRT subtitle file into an MP4 file

MP4Box -add {{input-subs.srt}}:lang=eng -add {{input.mp4}} {{output.mp4}}

Combine audio from one file and video from another

MP4Box -add {{input1.mp4}}#audio -add {{input2.mp4}}#video {{output.mp4}