cd mp4box
cargo build --release
target/release/mp4dump path/to/video.mp4
target/release/mp4dump path/to/video.mp4 --decode
target/release/mp4dump path/to/video.mp4 --raw stsd --bytes 256
target/release/mp4dump path/to/file.mp4 --raw uuid:00000000-... # or compact hex prefix after 'uuid:'