[Jaroslav Černý]

It auto detects your connection quality, even if you sometimes browse a recorded video not livestream and switch a lot back and forth in it to places where it has to get the data again and again it will drop down the quality when on auto so that it can buffer you that new and new seeking position faster. I bet it may do this even on very good connections, why? Because it saves YT bandwidth and other resources on their end of the connection.

There used to be browser plugins that could force specific things on YouTube including selected if available or minimal quality but YT changes so often almost none of the YT addons ever work for long.

There is nothing SRS can do about how you play YT or how YT sends you the stream.

You could always wait for end of stream and then download the best available version as file from YT if playback in web browser isn't working.