- Audio uses a codec named "Opus", with bitrates in the about 32Kbps.
- Video uses the VP8 codec, with a bitrates in the about 1600Kbps.
The bitrate can change to suit the network conditions. Bad network conditions are on the level of a mobile phone call, good network conditions have audio quality on par with MP3 files.
By specifying the video resolution and frame rate according to the usecase, you can effectively use the network band.