What are the bandwidth requirements for running a BigBlueButton server?
When sharing a webcam, as a moderator BigBlueButton lets you select 320×240 or 640×480. Both use the same amount of bandwidth, roughly 30-50 kbytes/second per stream. Viewers can only share a 320×240 webcam. For example, if you have a room with 5 users, each sharing their webcam, then the you can calculate the bandwidth usage as follows: • Y = 30-50 Kbytes/sec; let’s assume 40 Kbytes/sec on average • W = amount of webcams that are streaming • U = amount of users that are watching For calculations: • server incoming bandwidth: W*Y • server outgoing bandwidth: W*(U-1)*Y (minus one since a broadcaster does not have to subscrive to his own stream) For example, with 5 users in a room with 5 webcams streaming, the bandwidth calculation is as follows: • in: 5*40 = 200 Kbytes/sec incoming bandwidth needed to the server (e.g. 1.6 Mbit) • out: 5*(5-1)*40 = 800 Kbytes/sec incoming bandwidth needed from the server (e.g. 6.4 Mbit) • Total traffic used after one our: 60 mins*60 secs*(200 + 800) = 3.
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