Remove video from Google Pixel MP (Motion Photos) files

process.sh

#!/usr/bin/env bash

# Based on:
# https://mjanja.ch/2021/10/stripping-embedded-mp4s-out-of-android-12-motion-photos/
# https://gist.github.com/alanorth/371696685ebf65ac5e04536870916e82

shopt -s globstar

for file in ./**/PXL_*.MP.jpg ./**/MVIMG_*.jpg; do
    # Don't crash when there are no files matching the glob
    [ -f "$file" ] || continue

    echo $file

    # Check MP4 header, newer versions first
    unset ofs
    for header in 'ftypisom' 'ftypmp4' 'ftypmp42' 'ftypiso6'; do
        ofs=$(grep -F --byte-offset --only-matching --text "$header" "$file")

        if [[ $ofs ]]; then
            ofs=${ofs%:*}
            truncate -s $((ofs-4)) "$file"

            # Go to next image
            break
        fi
    done
done