tldr/pages/common/mp4box.md

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# mp4box
> MPEG-4 Systems Toolbox: muxe streams into MP4 container.
> More information: <https://gpac.wp.imt.fr/mp4box>.
- Display information about an existing MP4 file:
`mp4box -info {{path/to/file}}`
- 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}}`