Slick app, works perfectly with my Amazon Fire TV! I've been trying so hard to find a decent implementation for sending web videos to my Fire TV. I only have a Chromecast Audio device so it's been killing me when I would see the Cast to option on videos and could only Cast to my audio receiver. I've been using SPMC with Yatse to send videos, but it's a slightly cumbersome process.
If you still have any codes left I'd appreciate it!