Optimize camera resolution

[nickvergessen]

Known issue

• Some servers are set to 256kb/s for video streams
• That does not fit Low+Medium quality of a simulcast
• So only Low gets send which is very bad perception-wise
• We should therefore:
  • Check that the default resolution we ask from the browsers fits into the default maxstreambits of the HPB and if needed increase that to be at least of some quality
  • Optimize the resolution based on known maxstreambits when received from the HPB: Return bandwidth information in room responses. strukturag/nextcloud-spreed-signaling#1099
  • Work together with the HPB to allow more maxstreambits in 1-1 cc @fancycode
  • Work together with the HPB to allow a "optimal streambits per conversation", so that a room could e.g. get 10mbps, if one person is only streaming video, everyone sees them in full hd, if 8 people have the video on, everyone gets ~1.25mbps, if 40 people have video on, the math would be 0.25 mbps, but a minimum should be retained to at least fit the Low quality

[fancycode]

• Improve constraints in src/utils/webrtc/VideoConstrainer.js

I had to change the constraints in the high quality to explicitly request 1280x720 on my laptop. Otherwise I always capture 640x480, no matter what the maximum bitrate is on the HPB side:

spreed/src/utils/webrtc/VideoConstrainer.js

Lines 171 to 178 in 3221103

	width: {
	ideal: 720,
	min: 640,
	},
	height: {
	ideal: 540,
	min: 480,
	},