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Vaflya, you write some amusing things. In this discussion, it's perfectly clear what bitrate is needed for a given resolution, and when streaming at 1280-720, the bitrate only reaches 1000+ during peaks, I emphasize, during peaks.
Regarding fullscreen mode, how else would people stream? Everything works perfectly, including in OBS.
About the coefficient – it's all very debatable. And as I said, almost all top streamers set 25 FPS.
Added 4 minutes later
And I forgot about the excessively high bitrate values. How will a person be able to watch a stream if your bitrate is, for example, 3k+, if their speed is much lower? And we shouldn't forget that Justin will reduce the bitrate if it's too high, and as a result, reducing the bitrate leads to a loss of quality – it's unclear with what codec and all the consequences.