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# clouds
steep-balloon-41261
08/25/2023, 6:38 PMThis message was deleted.
m
magnificent-art-43333
08/25/2023, 6:54 PM@billowy-engine-53769 estimating that is going to vary quite a bit based on a few variables:
• How many people will be in your video call?
• How long will they spend there?
• What resolution video are you using for each person?
b
billowy-engine-53769
08/26/2023, 4:01 AMThere will be 100 people in the room
The session will be of 1 hour
Video quality is default with H264 video codec
m
magnificent-art-43333
08/26/2023, 5:09 AMHow many on the screen at once? (Assuming video on for all)
b
billowy-engine-53769
08/26/2023, 6:30 AMthere will be 5 max
billowy-engine-53769
08/26/2023, 6:31 AMwith their video and on
m
magnificent-art-43333
08/29/2023, 4:41 AM@billowy-engine-53769 @bland-lion-28941 here’s how you can compute this —
first, use this guide to figure out the bitrate, let’s call it 540p using H.264 (webcam streaming), so 1.1Mbps per user on screen.
1.1Mbps / user * 5 users = 5.5 Mbps
5.5 Mbps * 60 seconds * 60 minutes = 19800 megabits published per session
19800 megabits / 8 bits/byte * 10^-3 = 2.475 GB upstream per session
2.475 GB * 100 subscribers = 247.5 GB downstream per session
b
billowy-engine-53769
08/29/2023, 4:02 PMThen, how much total data transfer per session would be in terabytes? @bland-lion-28941 @magnificent-art-43333
m
magnificent-art-43333
08/29/2023, 4:09 PMTera is another 10^-3, so 0.2475 TB
magnificent-art-43333
08/29/2023, 4:11 PMAlso, here, I assumed 540p for everyone — I’m not sure if that’s correct (it might be lower). Second, I would highly suggest you turn on VP9, it’s available cross-platform with LiveKit. VP9 will cut your bitrate (and thus, your total data transfer) by ~50%!
b
billowy-engine-53769
08/29/2023, 4:17 PMThankyou so much for transferring the knowledge.
We would implement the VP9 feature.
billowy-engine-53769
08/29/2023, 4:19 PMcan you suggest how can we implement this feature in Flutter?
billowy-engine-53769
08/29/2023, 4:22 PM Copy code
defaultVideoPublishOptions: VideoPublishOptions(
videoEncoding: VideoParametersPresets.h720_169.encoding,
videoSimulcastLayers: [
VideoParametersPresets.h180_169,
VideoParametersPresets.h360_169,
],
),m
magnificent-art-43333
08/29/2023, 4:24 PMcc @freezing-lifeguard-43174 @dry-elephant-14928
magnificent-art-43333
08/29/2023, 4:25 PM(you’ve hit the limits of my knowledge 😛 I need to bring in people smarter than me now)
b
billowy-engine-53769
08/29/2023, 5:21 PM@dry-elephant-14928 can you help us out on this issue?
d
dry-elephant-14928
08/30/2023, 1:15 AMVP9 support isn't released yet for flutter. when it is, you should be able to set videoCodec in publish options