Question / Help Does a 1080p webcam require more upload speed then a 720p ?

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lynaris0

New Member
Hello there, I hope you can help me out :)

I am Streaming league of legends in 1080p 30fps with 1650 max bitrate / buffer size.
I used to stream in 720p 30fps, but a few days ago i tried out to stream in 1080p, and for all the viewers it was not lagging and the picture quality was much enjoyable.

Since i used streamed in 720p i got myself the logitech c525. (720p cam).

My question now is the following:

http://www.twitch.tv/lynaris0/b/521016358 (this is already in 1080p)

If i get myself the c920 (1080p cam) will the pixelation which occurs when something fast on the monitor is happening in the camera window stopp ? Or does this pixelation happen because i dont have enough upload speed?

I hope you can help me out :)!
Kind regards,

lynaris0 | David
 
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DryRoastedLemon

Member
Hey there. The upload speed you need is solely determined by the bitrate you set up in OBS. So if you have set up your stream to render at 1650kbps, you only need 1650kbps plus your audio bitrate of upload capacity. The quality of your stream will become worse if you increase the resolution of your stream while keeping the bitrate the same, however. Any pixelation happening is not due to your upload speed, but because of the video bitrate you use.
 
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lynaris0

New Member
What do you mean by the video bitrate ? :( sry i might be a total noob to ask that but what is the video bitrate ? Is it the same as the max bitrate in the video encoding settings ?
 
Jack0r

Jack0r

The Helping Squad
Yes, thats the video bitrate.
Maybe the best explanation for your problem is the following: Before the "final" video can be send out, it has to be compressed, so its in an usable size for the internet. The encoder that does this job now receives picture by picture of everything you see. It does not "see" oh, that part is a webcam, and that is game footage. So it then checks, ok I got 1650kbps to work with for this picture (simplified, there is of course a very complex calculation going on) and just compresses it.
Now when there is a lot of action going on in your game and the overall bitrate is too low, the overall quality of your picture will go down as well. This is what you see when your webcam picture on screen does not look good while there is fast movement on screen.
In general the solution is to either, increase the bitrate, lower the resolution, or increase the compression. So this is something you could test, but do not expect perfect quality of your webcam at all time.
 
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