Trying to get a YouTube video playing on Chromecast, not using the YouTube receiver but simply the iframe YouTube api. When the receiver url is loaded in a desktop chrome browse
Here's the code I'm currently using on my receiver. The message handling (both directions) is hit and miss, and I'm currently working through that ... but the loading of the iFrame library, the embedding of the video, etc. all works. If it doesn't work on your end, we can start to investigate how your setup might be different. I've tried to add comments where it might be helpful.