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USB webcam

Hi,
I am using a usb camera with gspca driver for dm6446 based system. i have used capture application given

in v4l2 documentation http://v4l2spec.bytesex.org/spec/capture-example.html to capture images. my problem

is that it is giving timeout error in select operation. the device detection doesn't give problem & it gets registered

as /dev/video1. Do I have to do something else to get usb webcam running because the same application is running

properly with composite input signal device registered as /dev/video0.

here is the dump:
open_device 6
Input Name: ov519
Input Type: 2
VIDIOC_ENUMSTD: Invalid argument
 Menu items:
Control Brightness
Control Contrast
Control Color
Control Mirror
Control Vflip
/dev/video1 has no video overlay feature
/dev/video1 has streaming feature
Width:640
Height:480
PixelFormat:JPEG
PixField:1
bytes/line=640
BufLen:118784 BufType:1
BufLen:118784 BufType:1
BufLen:118784 BufType:1
capture_init_device
The framebuffer device was opened successfully.7
640x480, 16bpp

 screensize=614400
fb_init_device
gspca: usb_submit_urb alt 4 err -28
gspca: usb_submit_urb alt 3 err -28
start_capturing
select timeout: Invalid argument


--
Thanks & regards
yuvraj pasi