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mp4box — MPEG-4 Systems Toolbox: muxe streams into MP4 container. More information: <https://github.com/gpac/

Submitted by: @import:tldr-pages·Mar 2, 2026·

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mp4boxsystemscommandclimuxempegstreamstoolbox

Problem

How to use the mp4box command: MPEG-4 Systems Toolbox: muxe streams into MP4 container. More information: <https://github.com/gpac/gpac/wiki/Fragmentation,-segmentation,-splitting-and-interleaving>.

Solution

mp4box — MPEG-4 Systems Toolbox: muxe streams into MP4 container. More information: <https://github.com/gpac/gpac/wiki/Fragmentation,-segmentation,-splitting-and-interleaving>.

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}}

Code Snippets

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}}

Context

tldr-pages: common/mp4box

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