LinuxQuestions.org - Two Video Devices - /dev/video0 & /dev/video1

Whatever the driver is for the webcam, you need to query the driver and see if you can tell it to use /dev/video1.

For instance I have a Logitech QuickCam Express and the driver is mod_quickcam so I enter this:

Code:

# modinfo mod_quickcam

filename:    /lib/modules/2.4.21/kernel/drivers/usb/mod_quickcam.o

description: "Logitech Quickcam Express Webcam driver"

author:      "see README"

license:    "GPL"

parm:        debug int, description "Sets the debug output (1,2,4,8,16,32)"

parm:        interpolation int, description "Sets the interpolation mode (0-1)"

parm:        mode int, description "Sets the speed (0-1)"

parm:        keepexposure int, description "Keep gain settings across one open to another (0-1)"

parm:        tobgr int, description "Automatic RGB -> BGR conversion"

parm:        rgain int, description "Initial value of red gain (0-255)"

parm:        bgain int, description "Initial value of blue gain (0-255)"

parm:        ggain int, description "Initial value of green gains (0-255)"

parm:        bright int, description "Initial value for brightness (0-65535)"

parm:        video_nr int, description "Set videodevice number (/dev/videoX)"

So I hi-lighted the parameter I need to pass to the driver i.e. video_nr 1. Now I just edit /etc/modules.conf and pass the parameter to the mod_quickcam driver like thus:

alias camera mod_quickcam video_nr 1

To verify it worked I check in /proc/video/dev

Code:

# cat video0

name            : BT878(Hauppauge (bt878))

type            : VID_TYPE_CAPTURE|VID_TYPE_TUNER|VID_TYPE_TELETEXT|VID_TYPE_OVERLAY

hardware        : 0x1

[dev]# cat video1

name            : Logitech Quickcam Express USB

type            : VID_TYPE_CAPTURE

hardware        : 0xcf1aa310