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no video using UVC and quickcam notebook pro

I've been playing with uvc, and the most common source of problems is the
USB (in my experience).

You have to plug the camera in a USB2.0, and make it sure that is 2.0, not a
Hub and not a usb extension to plug more devices in the same bus. It might
also help if you plug the webcam in an isolated bus, i mean, only 1 device
per USB bus (they are often set by couples)

While testing in my computer, realised that plugging in a 1.0 or 1.1, makes
the /dev/video0 or the /dev/v4l/video0, but it never gives a valid image.
That should be because the webcam gives you 2 kind of frames, compressed and
YUYV, and only compressed is available in a 1.0 or 1.1 USB.

The most tipical behaviour in capture software is
to bail out decoding if the format on the buffer is unsupported.

try with that or pray to god. :D

bye!



On 2/4/07, Laurent Pinchart <laurent.pinchart (at) skynet.be> wrote: 

Hi George,

> I recently got a Logitech Quickcam Notebook Pro and was trying to use
the
> UVC driver to get it working.  I checked out a trunk as of 10 minutes
ago,
> did a make, make install... and plugged in my camera.  I then saw this:
>
> usb 1-4.3: new high speed USB device using ehci_hcd and address 8
> usb 1-4.3: configuration #1 chosen from 1 choice
> uvcvideo: Found UVC 1.00 device <unnamed> (046d:08cb)
> usbcore: registered new driver uvcvideo
> USB Video Class driver (v0.1.0)
>
> it created /dev/v4l and /dev/v4l/video0
>
> I then opened up mplayer, which I am successfully able to watch TV in
with
> ivtv since i built in support for v4l... however when I open up video0
in
> mplayer i get: Playing /dev/v4l/video0.
> Win32 LoadLibrary failed to load: avisynth.dll, /avisynth.dll,
> /usr/lib/win32/avisynth.dll, /usr/local/lib/win32/avisynth.dll
>
> and the video from the camera never plays.
>
> I also tried using "camsource" which worked with another webcam of mine
on
> a separate computer and that also was not able to open the device and
> capture an image.
>
> The website says this camera is supported, and the hardware ID matches.
>
> Just looking for any help and suggestions!  I would greatly appreciate
it.

Could you pleas try luvcview ? Some software don't work with the Linux UVC
driver, as they don't implement V4L2 support properly (or at all).

Best regards,

Laurent Pinchart

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