Firewire camera

2007-09-02T22:17:39Z

Jpotelle:

== Procedure ==
# Go to the device tree
# Select the computer that the camera is connected to in the device tree
# Click "Create Child Device" to create a child device under the computer.
# "Pick Device Template"
## Select the Interfaces/Specialized (#97) device category
## Select the "Firewire Camera to V4L Pipe" device template and click "Add Device"
# Repeat steps 2 through 4
## Select the Interfaces/Surveillance Video Interfaces (#111)
## Select the "Motion Wrapper" and "Add Device". At this point the "Motion Wrapper" is selected in the device tree. If it's not, select it.
# "Create Child Device" under the "Motion Wrapper"
# Pick Device Template "Generic Analog Camera"
# Type "31" in the "#1 Device" Device Data field.
# Reboot the machine with the Firewire camera for it to install the software.
# Regen the Orbiter so it shows the "Generic Analog Camera"
# Push the button. I know you want to :) At this point you should see pictures from the camera.

== Notes ==

Where did that 31 come from... and what other fields have to be changed and how when adding a second camera.

Firewire cameras are not V4L-capable so a translation needs to take place. We do it by means of vloopback which '''prives'''''(what is this word supposed to be)'' V4L pipes and a program that reads from the Firewire camera and feeds pictures into one end of a V4L pipe. We started device numbers from 30 in the case of vloopback.

Interesting DeviceData entries for the "Firewire Camera to V4L Pipe":
* Device (#1): the number X at the end of /dev/video1394-X where the camera provides its video data. First camera is 0, second camera is 1, and so on.
* Port/Channel Number (#12): The vloopback pipe associated with this camera. Usually you'd write the same number you wrote in the "Device" field above to reduce the chances of double allocation of the same pipe
* Width (#148) and Height (#149): If your camera displays weird images, but which seem to have a base in the real picture, the capturing resolution may not match the camera and you have to specify the correct capture resolution here. This resolution is camera-dependent.

Interesting DeviceData entries for the "Generic Analog Camera":
* Device (#1): The output end of a vloopback pipe where V4L video data is to be taken from. Since pipes come in pairs (one input/feed end, one output end) and their numbers start with 30, the first camera reads its pictures from /dev/video31 (pipe 0, /dev/video30 is the pipe feeding end), the second from /dev/video33 (pipe 1), the third from /dev/video35 (pipe 2) and so on. (Formula: 30 + 2 * pipe_number + 1 [that is: 2 * pipe_number + 31], where pipe_number is the pipe number you typed in the associated "Firewire Camera to V4L Pipe"'s "Port/Channel Number (#12)" field).

This procedure is not settled yet, and it's prone to change without notice, but it works like that for now.

[[Category: LinuxMCE_Devices]]
[[Category: Tutorials]]
[[Category: Hardware]]
[[Category: Cameras]]

Vim Tips & Tricks

2007-09-02T22:12:59Z

Jpotelle:

Source: [http://jmcpherson.org/editing.html Efficient Editing With vim]

==Writing code==
;Ctrl+n or Ctrl+p : Autocomplete ;)
;]p : Just like p, but it automatically adjusts the indent level of the pasted code to match that of the code you paste into. Try it!
;% : Putting the cursor on a brace, bracket, or parenthese and pressing % will send the cursor to the matching brace, bracket, or parenthese. Great for fixing parse problems related to heavily nested blocks of code or logic.
;>> : Indent the highlighted code. (See the earlier section about efficient text selection. If no text is selected, the current line is indented.)
;<< : Like >>, but un-indents.
;gd : Go to the definition (or declaration) of the function or variable under the cursor.
;K : Go to the man page for the word currently under the cursor. (For instance, if your cursor is currently over the word sleep, you will see the man page for sleep displayed.)

[[Category: Internal Documents]]
[[Category: Tutorials]]
[[Category: Programmer's Guide]]

PVR

2007-09-02T22:09:11Z

Jpotelle: Convert to redirect

#REDIRECT [[Personal Video Recorder]]

PVR

2007-09-02T22:02:26Z

Jpotelle: Add external link to Wikipedia.

[http://en.wikipedia.org/w/index.php?title=Personal_Video_Recorder Personal Video Recorder]

LinuxMCE - User contributions [en]

Firewire camera

Vim Tips & Tricks

PVR

PVR