Can i specify a /dev/video number?

Maverick1182 · 10-31-2006, 05:48 PM

Hi there i've finally managed to get my webcam to work with the right brightness setting to be able to be seen over the internet, i do this by running the following command when loading the driver

modprobe spca5xx GRed=500 GBlue=500 GGreen=500 gamma=4

the only problem is the webcam gets allocated a random number every time i boot i.e it can sometimes be /dev/video1 or /dev/video0 and other time. THis makes it rather irritating when i run my camera server as i need to specify which device i want to stream, it usually ends up streaming the tv card. I've looked through the modinfo of the spca5xx driver but theres no option to specify a device number as is available in the following link for mod_quickcam

http://www.linuxquestions.org/questi...ad.php?t=73435

I have a logitech quickcam messenger so i guess i can use this driver but its worked fine with the spca5xx driver up until now, so if it aint broke...(yet) lol

any ideas?

johnson_steve · 10-31-2006, 05:58 PM

udev rules maybe?
they keep my psp, iPod and iPod nano from getting mixed up I don't see why they wouldn't work for this purpose.

HappyTux · 10-31-2006, 06:43 PM

Quote:

Originally Posted by Maverick1182

Hi there i've finally managed to get my webcam to work with the right brightness setting to be able to be seen over the internet, i do this by running the following command when loading the driver

modprobe spca5xx GRed=500 GBlue=500 GGreen=500 gamma=4

the only problem is the webcam gets allocated a random number every time i boot i.e it can sometimes be /dev/video1 or /dev/video0 and other time. THis makes it rather irritating when i run my camera server as i need to specify which device i want to stream, it usually ends up streaming the tv card. I've looked through the modinfo of the spca5xx driver but theres no option to specify a device number as is available in the following link for mod_quickcam

http://www.linuxquestions.org/questi...ad.php?t=73435

I have a logitech quickcam messenger so i guess i can use this driver but its worked fine with the spca5xx driver up until now, so if it aint broke...(yet) lol

any ideas?

Not certain of the exact file in Gentoo but try using /etc/modules.conf and putting something like this in it.

Code:

alias char-major-81-0 bttv
alias char-major-81-1 spca5xx
options spca5xx GRed=500 GBlue=500 GGreen=500 gamma=4

This would assign the video0 to a bttv card with the Cam being the video1 and using the options you need to have loaded for it to work properly obviously changing the bttv to your tv card module.

Maverick1182 · 11-01-2006, 10:07 AM

From reading a few help sites on gentoo wiki i created a file: /etc/udev/rules.d/10-local.rules

KERNEL=="video[0-9]*", BUS=="pci", SYSFS{device}=="0x036e", SYSFS{vendor}=="0x109e", SYSFS{dev}=="81:0", NAME="video0", SYMLINK="video1TV_card_878", GROUP="video"

KERNEL=="video[0-9]*", BUS=="usb", SYSFS{idVendor}=="046d", SYSFS{idProduct}=="0920", NAME="video1" , SYMLINK="Mywebcam" , GROUP="video"

This seems to work on a restart.

Hope this helps anyone else.