Chromium sucks for streaming on the Raspberry Pi Pixel Desktop. One of my gripes was Youtube TV, ‘format not supported.’ Chromium Media Edition is much better. Ventz Petkov has a sweet install script. Here’s the tl;dr version.
curl -fsSL https://pi.vpetkov.net -o ventz-media-pi
sh ventz-media-pi
Check out his article at Raspberry Pi Netflix One Line Easy Install – along with Hulu, Amazon Prime, Disney Plus, HBO, Spotify, Pandora, and many others