Linux Media Labs
The LMLTW44 board is a multi-channel PCI board based on the TW6805 chip. These are the general LMLTW44 board's features:
You input is designated with $, for the command shell input prompt, and with # for superuser mode input. Your input and system response are presented in bold face. Filenames and URLs are underlined. System commands (line uname -r) are using San Serif font.
Open computer case. Install LMLTW44 card into available PCI slot. Attach octopus DB to 8 BNC cable. BNC inputs are numbered 1 to 8. Primary inputs (V4L2 composite input 1) are inputs 1 to 4. Secondary inputs (V4L2 composite input 2) are inputs 5 to 8.
To capture video from 4 cameras at full (25/30) frame rate, connect them to inputs 1 through 4.
You may load the bttv driver after each reboot manually, or modify the/etc/modules to let this happen automatically.
You may need to restart X11 after inserting the driver to prevent V4L X11 module from using cached video card settings that preventint the use of LML patches provided features.
To manually load the driver:
$ sudo /sbin/modprobe tw68
In order to load bttv.o module automatically you need to do the following:
Append the following line to file /etc/modules for LMLTW44:
run depmod to update system configuration:
# depmod -a
now, you should be able to autoload the driver when a program requests it.
Xawtv software allows you to test LMLTW44 card operation at rather low level.
sudo apt-get install xawtv
sudo yum install xawtv
You should create configuration presets and defaults for xawtv, by the way of editing ~/.xawtv file. This file is not created automatically during the installation process. You will need to create it in the home directory of the user(s) that will be using the application.
This is an example of the ~/.xawtvfile (for EU, PAL):
norm = PAL
input = Composite0
key = 1
norm = PAL
input = Composite1
key = 2
LMLTW44 has 4 independent video capture engines, that are represented as 4 separate devices:
in order to connect to a certain device use this command line xawtv invocation (this is 2nd input, counting from card top):
xawtv -c /dev/video1
this brings the video application windows, right clicking on it brings congifucation menu, left clicking allows to select video input (such as Camera1 or Camera2 for the configuration in section 6.3 above). In order to use different capture device you need to restart xawtv with differenct -c option (i.e. xawtv -c /dev/video0)
Zoneminder comes as a standard package in recent Ubuntu and Fedora distributions. When LMLTW44 is installed and driver configured you need to use /dev/video0(0) through /dev/video3(0) as Zoneminder 'local' type sources.
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The translation was initiated by Vassili Leonov on 2011-04-05