If you're the kind of person with a folder full of files, you might try something like

    find . -name '*.mkv' -o -name '*.mp4' | while read -r f ; do if ffmpeg -hide_banner -loglevel error -txt_format text -i "$f" -f srt - | grep -Ei 'Stanford|Berkeley|Caltech' ; then echo "# found in ${f}" ; fi ; done