v4l2_buffer with PBO mapped memory

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Hello,

I've written a program which shows my webcam with the v4l2 interface.
In the v4l2_buffer I use the type V4L2_BUF_TYPE_VIDEO_CAPTURE and the
memory is V4L2_MEMORY_USERPTR.
Everything works if I use malloced memory for frame buffers.
Now I want to get the frames directly in OpenGL. I've mapped a pixel
buffer object with glMapBuffer and wanted to use this as a frame buffer.
But if I use this memory, the ioctl VIDIOC_QBUF fails with 'invalid
argument'.

What can I do to use the pixel buffer object together with the v4l2
interface?
I want to use as less copy steps as possible.

Regards,

Thomas
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