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Hello,
We have a problem connecting 3 Logitech Cameras to a i7 notebook from Sony. When starting 2 cameras, the system works fine, but when starting the 3rd cam, vMix hangs. After hanging for about 1 minute, there is a error that the device is not responding (the error is in Dutch)
Any ideas?
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You're saturating the USB bandwidth. The max is about 2 USB Cameras on the same bus.
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Tom Sinclair did a video on using multiple Logitech cameras about a year ago But as mavrick816 noted too many USB devices on the same bus leads to problems.
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mavrick816 wrote:You're saturating the USB bandwidth. The max is about 2 USB Cameras on the same bus. Ok, so there is a max of 2 webcams per laptop? Is there a solution? All webcams run on 720p.
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@ Termelnl
It's more about 'bandwidth' across a USB bus. If the three ports share the same bus, you have likely 'overloaded' it.
What are the specks of your laptop?
How many USB ports do you have and do they all share the same bus?
Ice
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IceStream wrote:@ Termelnl
It's more about 'bandwidth' across a USB bus. If the three ports share the same bus, you have likely 'overloaded' it.
What are the specks of your laptop?
How many USB ports do you have and do they all share the same bus?
Ice Hello Ice, It's a 2012 Sony Vaio with an i7 and 8 gigs of memory. It runs Windows 8.1 on a Samsung 512 Gb SSD and has 2 USB's on the left side and 2 on the right. I don't know if they share the same bus. Is there a way to find out?
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Termelnl wrote:Hello,
We have a problem connecting 3 Logitech Cameras to a i7 notebook from Sony. When starting 2 cameras, the system works fine, but when starting the 3rd cam, vMix hangs. After hanging for about 1 minute, there is a error that the device is not responding (the error is in Dutch)
Any ideas? It all depends on the computer, CPU and graphics card. I can run 3 Logitech cams on a stock Dell Inspiron i7 laptop at the same time. A c930e and 2-c920s without any issues at 1280x720. Happy Mixing ~George
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Thanks for your awnser, but it's no solution. Is there any more I can look into?
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You can use Windows Device Manager (Windows 7) to check your USB ports/hubs.
Start -> Control Panel -> System & Security -> Device Manager -> Universal Serial Bus controllers -> USB Root Hub
You may have many USB Root Hubs. Some are "internal" hubs that are not connected to USB ports.
Right click the first USB Root Hub and select Properties. Click the Power tab to display the devices that are connected to that Hub.
You can use this process to determine what devices are connected to which hubs. If you see two webcams on one hub, try switching one webcam to a different port and repeating this process.
Not sure how this might work in W8 or W10.
Good luck!
- Tom
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Bear in mind that you have control over the manner in which the camera sends the stream over the USB bus.
If you leave the video format at "Default" it will generally use something uncompressed. That uses the available bandwidth very quickly.
If you explicitly change the video format to "MJPG" the camera will send MJPEG compressed frames. The result is dramatically less use of the USB bus.
This MJPG capability is part of UVC 1.1, which many cameras support.
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This afternoon I was tinkering with some webcams and decided to build a simple example of using four webcams on one computer. YouTube clip of 4 webcams into vMix The image above is one from from the clip I uploaded to YouTube. - PNG title layer - Logitech HD Webcam Pro C920 (1280x720 @30 f/s MJPG) - Logitech BCC950 ConferenceCam (1280x720 @30 f/s MJPG) - AVER Information VC520 PTZ camera (1280x720 @30 f/s MJPG) - Microsoft Lifecam Studio (1280x720 @30 f/s YUY2) - MP4 background animation All three cameras set to send MJPG streams are connected to the same USB 3.0 hub, onward to a USB 3.0 port on the desktop. The MS camera could not be set to send MJPG stream without loading it's proprietary driver, which I did not want to do. So it's connected to a separate USB 2.0 port. My 3 year old desktop was running CPU around 35% and render time of 5-7 ms with this scene running. Michael
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