libv4l2: error mmapping buffer 0: Permission denied

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Hello,

I'm trying to get a labtec 2200 usb webcam working on my custom ARM platform.
Since that webcam produces only images in pjpeg, I'm using libv4l2.
I wrote a simple capture application where I want to read a single
image in rgb24.
When the application invokes v4l2_read I get the above error.
The error comes from mmap which is invoked in libv4l2, but I've no
idea whats wrong there.
Can someone give me a hint how to fix this?

Thanks

Niko
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