Hello
I would like to download a youtube video and put it in an audio player.
Hi
Well, an audio player may not be able to process a video, but App Inventor's video player can, depending on file size, or you can use Activity Starter from your App to run the phone's video player (outside of your App) or you can use the WebView component (or better still the extension 'Custom Web View') to view YouTube in it's entirety or just one specific video.
You can only download a YouTube video if you have permission from the owner to do so.
In fact the goal is to create an audio player for several platforms