The video above is from directly from youtube.com/watch?v=u9lj-c29dxI. Playing at 1080p.

Zorn uses the Invidious URL parameters to fetch the Youtube video and audio.

You must add the "Audio" option for Zorn for audio to work correctly for higher quality videos.

For the URL parameters, the "itag" parameter is mainly use to fetch the correct quality you want for the video player. It uses 1080p by default if one is not set.

It is recommended, during production, to run your own Invidious instance with rotating proxy. Rotating the proxy should avoid blockage from YouTube, as YouTube heavily trying to shut down the Invidious project.