tldr/pages/common/mp4box.md

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}