Webcam: Difference between revisions
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== Linux == | == Linux == | ||
To get a webcam working for Linux, ensure that it's supported. Newer webcams tend to have support though cheaper non-HD webcams from China might not. You should see a | To get a webcam working for Linux, ensure that it's supported. Newer webcams tend to have support though cheaper non-HD webcams from China might not. You should see a {{code|/dev/video0</code> device when the webcam is plugged into the computer. If not, check {{code|dmesg</code> and see if the USB device is being detected. {{code|lsusb</code> should also list it. | ||
The default permissions set to | The default permissions set to {{code|/dev/video0</code> is set by udev. If you need to change the device permissions (say making it world read/writable), you will need to create a udev rule by creating a new file in {{code|/etc/udev/rules.d/</code> with the following contents: | ||
<syntaxhighlight lang="text"> | <syntaxhighlight lang="text"> | ||
| Line 9: | Line 9: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
The Vendor ID and product ID must match the values from | The Vendor ID and product ID must match the values from {{code|lsusb</code>. For the example above (a Microsoft LifeCam VX-2000): | ||
# lsusb | # lsusb | ||
Bus 001 Device 005: ID 045e:0761 Microsoft Corp. | Bus 001 Device 005: ID 045e:0761 Microsoft Corp. | ||
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* uvccapture | * uvccapture | ||
You may configure the webcam settings using | You may configure the webcam settings using {{code|v4l-utils</code>. See http://www.techytalk.info/webcam-settings-control-ubuntu-fedora-linux-operating-system-cli/ | ||
=== fswebcam === | === fswebcam === | ||
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=== uvccapture === | === uvccapture === | ||
Another utility to capture webcam images is | Another utility to capture webcam images is {{code|uvccapture</code>. | ||
[[Category:Linux]] | [[Category:Linux]] | ||
{{Navbox Linux}} | {{Navbox Linux}} | ||
Revision as of 19:13, 24 February 2017
Linux
To get a webcam working for Linux, ensure that it's supported. Newer webcams tend to have support though cheaper non-HD webcams from China might not. You should see a {{code|/dev/video0 device when the webcam is plugged into the computer. If not, check {{code|dmesg and see if the USB device is being detected. {{code|lsusb should also list it.
The default permissions set to {{code|/dev/video0 is set by udev. If you need to change the device permissions (say making it world read/writable), you will need to create a udev rule by creating a new file in {{code|/etc/udev/rules.d/ with the following contents:
SUBSYSTEM=="video4linux", BUS=="usb", SYSFS{idVendor}=="045e", SYSFS{idProduct}=="0761", NAME="video0", MODE="0666"
The Vendor ID and product ID must match the values from {{code|lsusb. For the example above (a Microsoft LifeCam VX-2000):
# lsusb Bus 001 Device 005: ID 045e:0761 Microsoft Corp.
To capture images, use any one of the following utilities:
- fswebcam
- uvccapture
You may configure the webcam settings using {{code|v4l-utils. See http://www.techytalk.info/webcam-settings-control-ubuntu-fedora-linux-operating-system-cli/
fswebcam
fswebcam -r 640x480 --jpeg 85 -D 1 web-cam-shot.jpg
Dumping fswebcam images via HTTP
You can make a quick an dirty wrapper around the command above so that it can be viewed via the web.
<?php
system("fswebcam -r 640x480 --jpeg 85 -D 1 /tmp/out.jpg > /dev/null");
header("Content-Type: image/jpeg");
echo file_get_contents("/tmp/out.jpg");
uvccapture
Another utility to capture webcam images is {{code|uvccapture.