KennyR wrote:
Would just like to point out that if you can find lower quality stream urls (not the https://www.youtube.com/watch?v=BlAhbLaH page url) on YouTube, they probably won't be split into different streams. As far as I'm aware 720p and above store video and audio seperately.

On a related note, SMPlayer (MPlayer's guified fork, not currently available on MorphOS) has recently given up trying to parse or mux YouTube urls itself and now uses youtube-dl to do so. Google change the site so often that it's a waste of time trying to maintain any kind of video url extraction software. At least ytdl is updated very often. Pity it's written in Python (though Windows has a native exe) and slower than grass growing.