Stuttering issues when using multiple cameras

[Christopher Swenson]

Hi folks,

All logs provided after this post

What I'm trying to do:
-Use two different scenes for two different situations. One scene has my main webcam, the other has my "piano" cam
-Flip between scenes

What I'm using:
-Scene 1: Canon Rebel t3i with webcam utility & external microphone (AT2050) and interface (Focusrite Scarlett Solo)
-Scene 2: Konftel Cam20 webcame & Konftel Ego Audio unit with Konftel OCC Hub

The issue:
Scene 2. When the DSLR (Canon) camera is turned off, I'm having 0 issues with the Konftel Cam20. The frames are smooth and everything works fine. The second I turn on the DSLR main webcam, the Konftel Cam20 starts lagging and stuttering like crazy.

What I tried:
Updated Konftel utilities & drivers, Updated Motherboard chipset drivers (well, there hasn't been an update since 2012 on the support site), I also tried using an old Logitech webcam instead of the Cam20 (same stuttering happened), and I tried plugging the Cam20 straight into a USB port instead of the OCC Hub

Logs:
Both log files have 10 seconds of recording.

Let me know if you need any other information!
TIA

C

 

[FerretBomb]

Make sure both cameras are on separate USB root hosts. Most likely, having both cameras on is causing an insufficient bandwidth issue, as with USB 2.0 there is a theoretical limit of 480mbps per root host. Even if they are plugged into USB 3.0 ports, they still have to use 2.0 transfer limitations due to patents by VIA.
You can use the USBView tool to easily check what is connected to where, if you need to relocate USB plugs to place the two cameras on separate USB host controllers.

 

[Christopher Swenson]

Make sure both cameras are on separate USB root hosts. Most likely, having both cameras on is causing an insufficient bandwidth issue, as with USB 2.0 there is a theoretical limit of 480mbps per root host. Even if they are plugged into USB 3.0 ports, they still have to use 2.0 transfer limitations due to patents by VIA.
You can use the USBView tool to easily check what is connected to where, if you need to relocate USB plugs to place the two cameras on separate USB host controllers.

Man, I KNEW it would be something as small as this. Thanks for the help - works like a charm now.

 

[killerrosebud]

jesus fucking christ TWO SECONDS on Google just fixed WEEKS of bashing my head against a wall
i'd just assumed that since i have 3 USB hubs plugged in (two monitors and a mousemat) that i was overextending the USBs bandwidth, turns out all i had to do was move ONE camera to a DIFFERENT PORT

 

[koala]

TWO SECONDS on Google just fixed WEEKS of bashing my head against a wall

Almost all questions in this forum can be answered by investing 2 minutes into a Google search. Not two seconds, but 2 minutes is usually enough.

If you don't find an answer to some of your issue in 5 minutes on your own, google it. Google knows it. I didn't try ChatGPT for OBS issues yet, but I guess it's also a good assistant in this case.