zc3xx webcam (041e:4034 Creative Webcam Instant) stopped working some time ago (since gspca kernel integration?)

zc3xx webcam (041e:4034 Creative Webcam Instant) stopped working some time ago (since gspca kernel integration?)

[Timo Paulssen]

Hello,

I recently tried using my webcam, the Creative Webcam Instant (usb ID
041e:4034) again, but I can't get it to work any more.

When I started using this webcam, i could get it to work with the
spca5xx driver, which I usually compiled per hand and inserted into the
kernel. Then came gspcav1, which worked, too. But with the gspca, that
is integrated in the kernel now (I'm using 2.6.27.9 retrieved from
kernel.org) the webcam won't work.

The first symptom is, that spcaview won't start any more and camstream
spits out these lines while showing a black window at the size i requested:


W: run(): VIDIOCSYNC(1) failed (Invalid argument)
W: VDLinux::run() VIDIOCMCAPTURE failed (Invalid argument)


similarly, spcaview tells me:


cvsync err
: Invalid argument
cmcapture: Invalid argument
>>cmcapture err -1
cvsync err
: Invalid argument


and then segfaults.

More interestingly, spcaview now complains, that my camera is "Not an
Spca5xx Camera !!".

Any help on how to get the camera working again would be very appreciated :)

Thanks for all the hard and good work,

  - Timo

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Re: zc3xx webcam (041e:4034 Creative Webcam Instant) stopped working some time ago (since gspca kernel integration?)

[Ian Pickworth]

Timo Paulssen wrote:
> Hello,
> 
> I recently tried using my webcam, the Creative Webcam Instant (usb ID
> 041e:4034) again, but I can't get it to work any more.
> 
> When I started using this webcam, i could get it to work with the
> spca5xx driver, which I usually compiled per hand and inserted into the
> kernel. Then came gspcav1, which worked, too. But with the gspca, that
> is integrated in the kernel now (I'm using 2.6.27.9 retrieved from
> kernel.org) the webcam won't work.
> 

I'm not a developer, so can't explain what the change is, but there is a
significant change to where the webcam data gets processed which was
introduced with the move of the gspca drivers into the kernel.

Basically, you now need a user space driver library - libv4l - to do the
work. You can get the library from here:

http://people.atrpms.net/~hdegoede/libv4l-0.5.7.tar.gz

After making it, you preload it when running spcaview like this:

LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so spcaview -d /dev/video_webcam

as an example.

Regards
Ian

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Re: zc3xx webcam (041e:4034 Creative Webcam Instant) stopped working some time ago (since gspca kernel integration?)

[Timo Paulssen]

Thank you very much! This made it work. I wonder why this information
isn't made prominent somewhere on some v4l information place (linuxtv
wiki?). Is it because the driver's not yet stable?


Kind regards
  - Timo

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Re: zc3xx webcam (041e:4034 Creative Webcam Instant) stopped working some time ago (since gspca kernel integration?)

[Ian Pickworth]

Timo Paulssen wrote:
> Thank you very much! This made it work. I wonder why this information
> isn't made prominent somewhere on some v4l information place (linuxtv
> wiki?). Is it because the driver's not yet stable?

I forgot another thing - after the driver change I found that the
exposure was all wrong. The answer for that is another user space
program - v4l2ucp - which adjusts the exposure rate, white balance etc.

Its project page is here:

http://sourceforge.net/projects/v4l2ucp/

Don't know about the documentation. I think v4l is a tricky area to
document, it keeps changing.

Regards
Ian

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