Artifacts during live-streaming

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djm

New Member
Hi there,

Apologies for not professional descriptions, if that make sense, but I've been experiencing (for the last year or so) a strange behaviour of 3 Logitech C920 webcams during live-streaming as well as during the recording. Every so often, the graphic glitches/artifacts appearing on those cameras. The best example of what I am trying to fight can be seen in 4:00 mins of this live stream recording: https://www.youtube.com/watch?v=MHILm1_I6xc . In fact, the whole stream is affected by this issue.

I noticed that if I reboot the PC, before start the streaming, the webcams working OK with no issues at all. The PC, however, is pretty old, and I am afraid that this could be the problem here. Either PSU or graphic card (50-60% usage during streaming) can't handle the process, but it's just my speculation. The PC is Dell Optiplex9020 with NVidia Quadro K620 graphics card. Could someone point me out, what it could be? Thanks.
 
deFrisselle

deFrisselle

Member
It's likely that your cams are on the same USB hub and hitting the bandwidth limit of the hubs bus

How do you have your cams connected Two C920 cams should be fine on a USB3 hub if they are the only devices connected
How many UBS ports and what USB versions does your motherboard have Plus what other UBS devices do you have connected
 
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sandrix

sandrix

Member
It is possible that this may be caused by a problem with the stream being processed by YouTube's AVC codec. Try running a test stream at 1080p 30 fps. In this case, VP9 should be here
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djm

New Member
deFrisselle said:
It's likely that your cams are on the same USB hub and hitting the bandwidth limit of the hubs bus

How do you have your cams connected Two C920 cams should be fine on a USB3 hub if they are the only devices connected
How many UBS ports and what USB versions does your motherboard have Plus what other UBS devices do you have connected
Click to expand...

Hi there,

Many thanks for your reply. In general, I have 6 web cameras in total. Two C920 are connected to USB 2.0 and one is connected to USB 3.0. Also, as the PC has 4 x USB 3.0 / 6 x USB 2.0 ports, almost all ports are used by other cameras and a mouse. Only one USB 3.0 port remain unused. Two C920 are connected via extender cable. It appears that the artifacts appearing only on C920 picture, other cameras are not affected.
 
D

djm

New Member
deFrisselle said:
It's likely that your cams are on the same USB hub and hitting the bandwidth limit of the hubs bus

How do you have your cams connected Two C920 cams should be fine on a USB3 hub if they are the only devices connected
How many UBS ports and what USB versions does your motherboard have Plus what other UBS devices do you have connected
Click to expand...

I think I sort out the problem by moving C920 cams onto a different USB ports and the glitches have gone. I remember that I set them this way a long time ago, but last year or so I had to unplug everything and since then I had an issue with the picture. I will do a test stream, when I get more time, but at the moment the log doesn't show any issues and the glitches have gone. It's likely that C920 were on the same USB 2.0 bus and that was too much. I now switched them onto USB 3.0 and it seems all fine with 1920x1080@60p. You guys are legends, thank you for helping me out!
 
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