mp4box

MPEG-4 Systems Toolbox - Muxes streams into MP4 container.

More information.

• 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}

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