Please increase the number of cameras that can be seen simultaneously to 8. Four is not enough for a seminar-type classroom, because we need to see facial expressions.
Continuous presence of students is a great value for the teacher, as this delivers a permanent stream of non-verbal information about any student status, which lowers the need for repeated student activation methods to bring each of them "on stage". This value is often higher than the additional didactical value of teacher's live view (gestures in addition to voice, interaction celebration and content presentation)
However, multi video streaming might generate load on both server and participant's pipelines. With the new " up to 250 participants" feature, this idea might be loved very much, as 8+1 webcam streams + appsharing may destabilize such big groups. I therefore propose the idea to introduce a max. no of cams setting (similar to the setting in Collaborate Classic), which allows to decrease the load in case of large audience or bad internet participation.
See also this thread on large audience events
After some live discussions around that challenge (more video streams in parallel) I want to share my insight, that minor video resolution is sufficient to get basic facial expressions and behaviour alerts through the pipe. In a research project many years ago, teachers preferred to monitor all 15 student's non-verbals contineously in a 4x4 grid of QCIF-resolved thumbnails than monitoring only 4 last speaking students of 15 in parallel, but 4times better resolved.
Collaborate Classic has another knob to reduce bandwidth: The number of frames to be transmitted might be configured. Again, there is no need to have a fluent expression of motion in facial expressions. 15fps is far enough. Beverly might be happy with 8 simultaneous views on the total group running at 10fps or less.
Just a hint for developers having calculatet the bandwidth to tramsmit 8 Full HD cam streams in parallel....
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