Difference between revisions of "USB and Webcam Tests"
From wikidb
(New page: === Webcam Test Programs === luvcview and guvcview are display programs that can be used to test a webcam. uvccapture will save an image to the current directory. Each were installed with...) |
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| + | |||
| + | === Trouble Shooting Webcams === | ||
| + | |||
| + | After plugging in the webcam, make sure its driver has been activated. Make sure the /dev/video0 is there: | ||
| + | <pre> | ||
| + | eepp@tabor:~$ ls -l /dev/video0 | ||
| + | crw-rw----+ 1 root video 81, 0 2012-05-12 09:44 /dev/video0 | ||
| + | </pre> | ||
| + | |||
| + | You can force this with | ||
| + | <pre> | ||
| + | mknod /dev/video0 c 81 0 | ||
| + | </pre> | ||
| + | |||
| + | <pre> | ||
| + | eepp@tabor:~$ lsmod | grep uvcvideo | ||
| + | uvcvideo 57438 0 | ||
| + | videodev 34457 1 uvcvideo | ||
| + | v4l1_compat 13251 2 uvcvideo,videodev | ||
| + | </pre> | ||
| + | |||
| + | If not, as root do a | ||
| + | <pre> | ||
| + | insmod /lib/modules/2.6.32-38-generic/kernel/drivers/media/video/uvc/uvcvideo.ko | ||
| + | </pre> | ||
| + | The version numbers depend on Linux version installed. | ||
Revision as of 09:44, 12 May 2012
Webcam Test Programs
luvcview and guvcview are display programs that can be used to test a webcam. uvccapture will save an image to the current directory. Each were installed with Synaptic. For example to run luvcview:
eepp@tabor:~$ luvcview luvcview 0.2.6 SDL information: Video driver: x11 A window manager is available Device information: Device path: /dev/video0 Stream settings: Frame format: MJPG Frame size: 640x480 Frame rate: 30 fps
Trouble Shooting USB
Us lsusb from usbutils. You can check installation with Synaptic. For example:
eepp@tabor:~$ lsusb Bus 004 Device 006: ID 04fe:0006 PFU, Ltd Bus 004 Device 005: ID 04fe:0008 PFU, Ltd Bus 004 Device 003: ID 03eb:21fe Atmel Corp. Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 003: ID 05ac:0304 Apple, Inc. Optical USB Mouse [Mitsumi] 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 Bus 001 Device 010: ID 046d:0805 Logitech, Inc. Bus 001 Device 007: ID 06c2:0059 Phidgets Inc. (formerly GLAB) Bus 001 Device 006: ID 06c2:0045 Phidgets Inc. (formerly GLAB) PhidgetInterface Kit 8-8-8 Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
For example the following will give you a lot of information about the Logitech webcam on bus 1 device 10.
eepp@tabor:~$ lsusb -s 1:10 -v bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 ? bDeviceProtocol 1 Interface Association bMaxPacketSize0 64 idVendor 0x046d Logitech, Inc. idProduct 0x0805 ...
Trouble Shooting Webcams
After plugging in the webcam, make sure its driver has been activated. Make sure the /dev/video0 is there:
eepp@tabor:~$ ls -l /dev/video0 crw-rw----+ 1 root video 81, 0 2012-05-12 09:44 /dev/video0
You can force this with
mknod /dev/video0 c 81 0
eepp@tabor:~$ lsmod | grep uvcvideo uvcvideo 57438 0 videodev 34457 1 uvcvideo v4l1_compat 13251 2 uvcvideo,videodev
If not, as root do a
insmod /lib/modules/2.6.32-38-generic/kernel/drivers/media/video/uvc/uvcvideo.ko
The version numbers depend on Linux version installed.
