explainshell.com - oldfind.1 . -type f \( -name '*.mp4' -o -name '*.mkv' \) -not -path './ignore/this/folder' -exec vlc {} \;

. -type f \( -name '*.mp4' -o -name '*.mkv' \) -not -path './ignore/this/folder' -exec vlc {} \;

search for files in a directory hierarchy

source manpages: oldfind