Download a video with a defined format, in this case the best mp4 video available (default is "bv\*+ba/b")
yt-dlp
yt-dlp --format "{{bv*[ext=mp4]+ba[ext=m4a]/b[ext=mp4]}}" "{{https://www.youtube.com/watch?v=oHg5SJYRHA0}}"
yt-dlp
yt-dlp --format "{{bv*[ext=mp4]+ba[ext=m4a]/b[ext=mp4]}}" "{{https://www.youtube.com/watch?v=oHg5SJYRHA0}}"