5.1 Surround Audio YouTube Playback Device Test - Not a speaker test (although can be used as one)
Update: This does now work in HTML5 based browsers. If you are only getting stereo, this test shows that your device does not decode the Opus multichannel stream.
Use stats for nerds then you can look up the codecs with this cool list on GitHub:
https://gist.github.com/sidneys/7095a...
Uploaded as a test for the YouTube playback encoder.
Maybe one day it will work!