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Currently there seem to be a number of factors that influence the quality of the transmitted/received video quality.
However, no matter what you do. If the displayed thumbnail size on the receiving side is lower than 720p, the sender seem to receive a hint to lower the transmitted resolution to the next lower step (360p).
This is most probably to generally optimize for bandwidth but it creates the problem that your local video display always looks sharper than the received ones. I think this is sometimes a bad idea.
I would like to wish for a button to "prefer quality over bandwidth reduction" or a slider of some sort (standard, prefer lower bandwidth, prefer higher quality).
There are other video conferencing softwares out that seem to not do this and the picture quality generally is much higher...