Improve video quality for livestream to Twitch.

[przemek-nowicki]

It works with v0.6, but I’m not happy with the quality. Figure out how to do it better.

Example stream (it will expire in 7 days):
https://www.twitch.tv/videos/2707247644

[przemek-nowicki]

It's much better starting from version 0.11, but it still needs some improvements that should come in upcoming releases.