View source for video 4 linux 2 notes

[[Category: Engineering]]
[[Category: Imaging]]

= V4L2 -- Video For Linux Version Two = 

== UVC ==

For a list of cameras that support UVC see the official [http://www.ideasonboard.org/uvc/ Linux UVC] site.
Full UVC support in Linux:

I have been using a Logitech HD Pro Webcam C910, USB Device ID: 046d:0821, for my tests.

== Gstreamer ==

See [[gstreamer]].

== Capture video and modify settings at the same time ==

Start `guvcview` with the '''--control_only''' option to display a GUI dialog to edit camera settings. This will work while another video display or capture application is already running.
<pre>
guvcview --control_only --device=/dev/video0
</pre>

== fswebcam ==

`fswebcam` is a small and simple tool for grabbing still images from a camera. The world needs more apps like this. It can grab a single image or grab sequences of images in a loop. It can save images to a file or pipe them to stdout.

<pre>
fswebcam --png --save fswebcam-test.png
</pre>



=== Common UVC patterns with `uvcdynctrl` ===

<pre>
apt-get install uvcdynctrl
uvcdynctrl --device=/dev/video1 --clist
uvcdynctrl --device=/dev/video1 --get='Focus, Auto'
uvcdynctrl --device=/dev/video1 --set='Focus, Auto' 0
uvcdynctrl --device=/dev/video1 --set='Focus (absolute)' 20
</pre>

= See also =

* [[Mplayer_notes#Webcam_preview_--_play_raw_video_stream_from_video_device]]
* [[Mplayer_notes#Record_video_directly_from_video_device]]