mp4box

mp4box

TLDR

Display information about an existing MP4 file

>_ mp4box -info [filename]
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Add an SRT subtitle file into an MP4 file

>_ mp4box -add [input_subs.srt]:lang=eng -add [input.mp4] [output.mp4]
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Combine audio from one file and video from another

>_ mp4box -add [input1.mp4]#audio -add [input2.mp4]#video [output.mp4}
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