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mp4decrypt — Decrypt an MP4 file. Part of the Bento4 tools. More information: <https://www.bento4.com/documentati

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

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Problem

How to use the mp4decrypt command: Decrypt an MP4 file. Part of the Bento4 tools. More information: <https://www.bento4.com/documentation/mp4decrypt/>.

Solution

mp4decrypt — Decrypt an MP4 file. Part of the Bento4 tools. More information: <https://www.bento4.com/documentation/mp4decrypt/>.

Decrypt a file using a specific key (key ID in hex, key in hex):

mp4decrypt --key {{key_id_hex}}:{{key_hex}} {{path/to/input_file.mp4}} {{path/to/output_file.mp4}}

Decrypt a file using a specific key for a track ID (track ID in decimal, key in hex):

mp4decrypt --key {{track_id}}:{{key_hex}} {{path/to/input_file.mp4}} {{path/to/output_file.mp4}}

Decrypt a file using multiple keys while displaying the progress of the decryption:

mp4decrypt --key {{key_id_1}}:{{key_1}} --key {{key_id_2}}:{{key_2}} --show-progress {{path/to/input_file.mp4}} {{path/to/output_file.mp4}}

Code Snippets

Decrypt a file using a specific key (key ID in hex, key in hex)

mp4decrypt --key {{key_id_hex}}:{{key_hex}} {{path/to/input_file.mp4}} {{path/to/output_file.mp4}}

Decrypt a file using a specific key for a track ID (track ID in decimal, key in hex)

mp4decrypt --key {{track_id}}:{{key_hex}} {{path/to/input_file.mp4}} {{path/to/output_file.mp4}}

Decrypt a file using multiple keys while displaying the progress of the decryption

mp4decrypt --key {{key_id_1}}:{{key_1}} --key {{key_id_2}}:{{key_2}} --show-progress {{path/to/input_file.mp4}} {{path/to/output_file.mp4}}

Context

tldr-pages: common/mp4decrypt

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