Sanzan is a simple encryption library to encrypt and decrypt videos while maintaining playability.

It uses NumPy and OpenCV to perform video frame manipulation, while using FFmpeg and Pydub for audio manipulation. Sanzan can be used either from the command line or in a Python program.

FFmpeg must be installed and in PATH.

pip install sanzan

sz -e original.mp4 -o encrypted.mp4 -pw <password>

sz -e https://youtu.be/dQw4w9WgXcQ -o encrypted.mp4 -pw <password>

sz -d encrypted.mp4 -o decrypted.mp4 -pw <password> -p

Use the -kv and -ka flags to specify keyfiles when decrypting.

sz -d encrypted.mp4 -o decrypted.mp4 -kv key.szvk -ka key.szak

Omit the -pw flag to encrypt using randomly generated keyfiles.

sz -e original.mp4 -o encrypted.mp4

Use the -s flag to hide progress bars. This might slightly improve performance.

Use the -c flag to specify the audio chunksize. The default is 100.

Use the -ex flag to export the keyfiles generated using a password.

Alternatively, Sanzan provides a Python interface to programmatically access its functionality.

from sanzan import Encryptor

PW = "p@ssw0rd"

if __name__ == "__main__":
    e = Encryptor("original.mp4")
    e.gen_key(password=PW)
    e.gen_audio_key(password=PW)
    e.set_output("encrypted.mp4")
    e.run()

from sanzan import Decryptor

PW = "p@ssw0rd"

if __name__ == "__main__":
    d = Decryptor("encrypted.mp4")
    d.set_key(password=PW)
    d.set_audio_key(password=PW)
    d.set_output("decrypted.mp4")
    d.run(preview=True)

• Audio is not supported for streams.
• Previewing audio is not supported.
• Because cv2.waitKey is unable to maintain a consistent playback framerate for cv2.imshow, preview mode will display frames as quickly as they are generated.
• Container formats like MKV will not decrypt reliably and must be converted to mp4 before encrypting. See this issue.