I have recently came across API errors during attempting to start a stream. The attached video documents the error message coming back from Youtube, in response to Wirecast API requests.

After making the video, I found the final piece of the jigsaw. In the youtube portal, under advanced, I had set this event to “Auto-start” (Automatically start the event when you start sending data). I incorrectly assumed that this was the same as the Auto-start setting in Wirecast.

To fix this bug, if Wirecast finds the youtube Autostart setting checked, it needs to skip setting broadcastSetting to testing and go straight to broadcast.