To create audio-less copies of all the .mp4 videos in a folder, execute the following:
find . -type f -name "*.mp4" -exec bash -c 'FILE="$1"; ffmpeg -i "${FILE}" -c copy -an "${FILE%.mp4}.ns.mp4";' _ '{}' \;
For a single file, the command would be:
ffmpeg -i input.mp4 -c copy -an output.mp4
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