If you’ve got a bunch of MP4s and need to know which ones have specific chapter metadata, this does it. Uses mediainfo and jq to scan each file and print matches.

This requires mediainfo and jq.

for FILE in *.mp4; do mediainfo $FILE --output=JSON | jq '.media.track[3].extra' | if egrep -q 'XXXXXXXX'; then echo $FILE; fi ; done

You may need to adjust the jq .media.track[3].extra to whatever track number your media has the menu information located.