Web Presenter USB Bit Rate

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Lynn Tisdale

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  • Joined: Tue Mar 28, 2017 7:32 pm

Web Presenter USB Bit Rate

PostTue Apr 18, 2017 7:27 pm

I am using the Web Presenter but I am not confident I am getting a high enough bit rate out of the USB port. Even at 30fps movement is not fluid. I am using a Canon G40 with 8Mbps 1080p output, SDI to Web Presenter and USB to MBP and OBS encoder.

Can anyone tell me what bit rate the Web Presenter is outputting on the USB port? Is Web Presenter downgrading the bit rate?

With this said I am thinking about switching to the Mini Recorder to insure the full bit rate gets to OBS.

Any suggestions?
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Denny Smith

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  • Location: USA, Northern Calif.

Re: Web Presenter USB Bit Rate

PostFri Apr 21, 2017 6:17 am

The Web Presenter outputs a 720p signal,in a variable frame rate to control the bit rate to match the streaming application available band width. So if the frame rate drops too low, the video will look "jumpy".
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Denny Smith
SHA Productions
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Phil Hadfield

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  • Joined: Wed Nov 27, 2013 5:34 pm

Re: Web Presenter USB Bit Rate

PostFri Apr 21, 2017 3:54 pm

What is the spec of the machine that you are connected to?
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Lynn Tisdale

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  • Joined: Tue Mar 28, 2017 7:32 pm

Re: Web Presenter USB Bit Rate

PostFri Apr 21, 2017 5:58 pm

I am using OBS classic on a 2017 Macbook Pro with 5Mbps upstream BW. Only using about 16% of processor at 30fps. Video still seems jumpy.

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