Особенно хорошо это заметно, когда по USB подключены 2 камеры:
Код: Выделить всё
[olej@xenix Face_recognition]$ ls -l /dev/video*
crw-rw----+ 1 root video 81, 0 авг 9 09:44 /dev/video0
crw-rw----+ 1 root video 81, 1 авг 9 09:44 /dev/video1
crw-rw----+ 1 root video 81, 2 авг 9 14:19 /dev/video2
crw-rw----+ 1 root video 81, 3 авг 9 14:19 /dev/video3
Код: Выделить всё
[olej@xenix 09]$ lsusb
Bus 001 Device 004: ID 0c45:62f0 Microdia
Bus 001 Device 003: ID 1908:2310 GEMBIRD
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 002: ID 2101:020f ActionStar
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Код: Выделить всё
[root@xenix dev]# dmesg
...
[ 4.201889] Linux video capture interface: v2.00
[ 4.234152] uvcvideo: Found UVC 1.00 device USB2.0 PC CAMERA (1908:2310)
[ 4.234966] uvcvideo 1-7:1.0: Entity type for entity Processing 2 was not initialized!
[ 4.234968] uvcvideo 1-7:1.0: Entity type for entity Camera 1 was not initialized!
[ 4.235105] input: USB2.0 PC CAMERA: USB2.0 PC CAM as /devices/pci0000:00/0000:00:1d.7/usb1/1-7/1-7:1.0/input/input12
[ 4.236132] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:62f0)
[ 4.246356] uvcvideo 1-8:1.0: Entity type for entity Extension 5 was not initialized!
[ 4.246360] uvcvideo 1-8:1.0: Entity type for entity Extension 4 was not initialized!
[ 4.246361] uvcvideo 1-8:1.0: Entity type for entity Processing 3 was not initialized!
[ 4.246363] uvcvideo 1-8:1.0: Entity type for entity Camera 1 was not initialized!
[ 4.246446] input: USB 2.0 Camera: USB Camera as /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/input/input13
[ 4.246526] usbcore: registered new interface driver uvcvideo
[ 4.246526] USB Video Class driver (1.1.1)
...