http://rochesterwebcam.com/live-webcams/rochester-new-york-park-avenue-cam without issue, can you confirm everything is working?
I get “broadcast not authorized” with that URL using Brave. It works in Chrome and Firefox.
I have the exact same problem with the same web cams in Buffalo and Rochester. It works with Brave Shields off.
That’s what worked for me. I’d give it a try.