Difference between revisions of "USB and Webcam Tests"
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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 guvcview: | 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 guvcview: | ||
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<pre> | <pre> | ||
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| − | An example window that opens is | + | An example of a window that it opens is: |
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| + | [[Image:Guvcview01small.jpg]] | ||
=== Trouble Shooting USB === | === Trouble Shooting USB === | ||
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=== Trouble Shooting Webcams === | === Trouble Shooting Webcams === | ||
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| + | ==== Is /dev/video0 Created ==== | ||
After plugging in the webcam, make sure its driver has been activated. Make sure the /dev/video0 is there: | After plugging in the webcam, make sure its driver has been activated. Make sure the /dev/video0 is there: | ||
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| − | + | ==== Is the uvcvideo Driver Loaded ==== | |
<pre> | <pre> | ||
Latest revision as of 22:17, 13 May 2012
Contents
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 guvcview:
eepp@tabor:~/Pictures$ guvcview
guvcview 1.1.3
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
bt_audio_service_open: connect() failed: Connection refused (111)
video device: /dev/video0
/dev/video0 - device 1
Init. UVC Camera (046d:0805) (location: usb-0000:00:1d.7-1)
{ pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' }
{ discrete: width = 640, height = 480 }
Time interval between frame: 1/30, 1/25, 1/20, 1/15, 1/10, 1/5,
...
An example of a window that it opens is:
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
Is /dev/video0 Created
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
As root you can force this with
mknod /dev/video0 c 81 0
Is the uvcvideo Driver Loaded
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.
