Differences between version 6 and predecessor to the previous major change of Video4Linux.
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| Newer page: | version 6 | Last edited on Friday, September 23, 2005 4:09:37 pm | by IanMcDonald | Revert |
| Older page: | version 4 | Last edited on Friday, September 23, 2005 10:50:10 am | by IanMcDonald | Revert |
@@ -1,7 +1,13 @@
-A framework for drivers of video cameras, TV tuners etc. The device [API] for userland processes is commonly called v4l or v4l2 (v4l being deprecated in theory). Drivers
written for this framework are normally compiled into the LinuxKernel as [Module]s. The devices are enumerated by [UDev] and appear as <tt>/dev/video0</tt>, <tt>/dev/video1</tt> etc.
+A framework for drivers of video cameras, TV tuners etc. The device [API] for userland processes is commonly called v4l or v4l2 (v4l being deprecated in theory). [DeviceDriver]s
written for this framework are normally compiled into the LinuxKernel as [Module]s. The devices are enumerated by [UDev] and appear as <tt>/dev/video0</tt>, <tt>/dev/video1</tt> etc.
You must have the <tt>videodev</tt> [Module] loaded as well.
-Some applications require a specific device name e.g. <tt>/dev/video</tt>. If
this is the case
then use mknod(1)
to create
a device entry or ln(1) to
link one if it already exists
. I suspect
this could also be done
with [UDev] as well but don't know much about that
.
+Some applications require a specific device name e.g. <tt>/dev/video</tt>, although
this is probably not
the desired behaviour and these apps will probably be modified in the future. If you are using an application that wants a <tt>/dev/video</tt> but your system only has a <tt>/dev/video0</tt>
then you need
to make
a symbolic
link.
+The proper way to do
this is
with [UDev]. Create (or modify) a file called <tt>00_video4linux.rules</tt> in the <tt>/etc/udev/rules.d</tt> directory, with the following content:
+<verbatim>
+# make a symlink to the first radio device
+KERNEL="video0", SYMLINK="video"
+</verbatim>
+
Also known as [V4L].
