This is a slightly more correct command I think: du -cb $(ldd $(which ffmpeg) | egrep -o "/[^ ]+" | cat <(which ffmpeg) - | xargs readlink -f) | tail -n1

This is a slightly more correct command I think: du -cb $(ldd $(which ffmpeg) | egrep -o "/[^ ]+" | cat <(which ffmpeg) - | xargs readlink -f) | tail -n1 I think this is what the ffmpeg.wasm-core project is compiling in: https://github.com/ffmpegwasm/ffmpeg.wasm-core/blob/n4.3.1-wasm/wasm/build-scripts/configure-ffmpeg.sh https://github.com/ffmpegwasm/ffmpeg.wasm-core/blob/n4.3.1-w... Overall I think the wasm size is pretty good, maybe even smaller than the non-wasm binaries to a first approximation.