问题
I am just wondering how many USB cameras can be accessed by one desktop PC? Is there any limit? I am planning to create my own Windows application (using .NET) to capture around 10 USB cameras that are connected to my desktop PC. Is this possible?
回答1:
The problem is not how many you can discover. On a single USB bus, ~127 could be possible.
But, a USB bus can only transfer a limited amount of bytes per second. So if you want to use more then one, you have to calculate the amount of bandwidth you have for the video stream.
Example : A USB bus normally can deliver realistically ~35 MB/s. 640*480*2 bytes per pixel => 614400 bytes per frame. @30 FPS this is ~17 MB/s, so you can use 2 cameras simultaneously with this setup.
回答2:
If that Actually, see code for connect 5 cams in to one computer( processor core i3, 8gb ram!!!) you need connect all cameras in to usb ports only on you'r computer!!! git hub link
回答3:
[Edited]
Actually, see this article which explains: Get List of connected USB Devices
I'm not sure there is a maximum. I will check and post back if I find out.
[Further Edit]
Can't find a documented maximum. Theoretically the ManagementObjectCollection should be able to hold millions of objects in it. If you ran into problems (which I doubt with 10 devices), you could just preallocate the collection size upon instantiation.
I've just ran a test and I can pick up over 10 USB devices through a hub. You should be fine.
回答4:
Maximum limit for usb devices connected to one host - 127. So, you can connect up to 100+ devices and they would work fine (100+ - because hub is also active device and have own address).
Possibly, you try to access first (already active) camera and program fails, because camera already locked?
来源：https://stackoverflow.com/questions/10239843/how-many-usb-cameras-can-be-accessed-by-one-pc