capturing webcam stream with V4L2 failed

I am getting started with the V4L2 framework on Ubuntu 10.4. currently I am using an webcam to do some tests. I am following [this][1] documentation to start, the installation was worked fine. I downloaded and compiled the application example. The problems is video output,I call the executable using: # modprobe -r pwc # modprobe -v pwc fps=15 compression=3 mbufs=4 fbufs=4 size=vga # ./capturer_mmap -D /dev/video0 -w 640*480 -p 0 | ./viewer -w 640*480 -p 0 given this output: ![enter image description here][2] Output on terminal: window size 640*480 Video bytespreline = 1280 Display: Image byte order = LSBFirst Bitmap unit = 32 Bitmap bit order = LSBFirst Bitmap pad = 32 Window: Depth = 24 Red mask = 0x00ff0000 Green mask = 0x0000ff00 Blue mask = 0x000000ff Bits per R/G/B = 8 Image byte order = LSBFirst Bitmap unit = 32 Bitmap bit order = LSBFirst Bitmap pad = 32 Depth = 24 Red mask = 0x00ff0000 Green mask = 0x0000ff00 Blue mask = 0x000000ff Bits per pixel = 32 Bytes per line = 2560 IsShared = True XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0" after 431 requests (19 known processed) with 0 events remaining. root@my-laptop:/home/foo/V4l2_samples-0.4.1# ./capturer_mmap -D /dev/video0 -w 640*480 -p 0 | ./viewer -w 640*480 -p 0 window size 640*480 Video bytespreline = 1280 Display: Image byte order = LSBFirst Bitmap unit = 32 Bitmap bit order = LSBFirst Bitmap pad = 32 Window: Depth = 24 Red mask = 0x00ff0000 Green mask = 0x0000ff00 Blue mask = 0x000000ff Bits per R/G/B = 8 Image byte order = LSBFirst Bitmap unit = 32 Bitmap bit order = LSBFirst Bitmap pad = 32 Depth = 24 Red mask = 0x00ff0000 Green mask = 0x0000ff00 Blue mask = 0x000000ff Bits per pixel = 32 Bytes per line = 2560 IsShared = True XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0" after 101 requests (19 known processed) with 0 events remaining. I have no idea how to fix this. I belive the probrem is in C code because I can to use webcam with Webcam Chesse application. Any help is very appreciated. Thanks a lot! [1]: http://alumnos.elo.utfsm.cl/~yanez/video-for-linux-2-sample-programs/ [2]: http://i.stack.imgur.com/PdjQ3.png
btw, what's the question? for my answer i thought that the image you see is not what you expected, but it's really unclear from your post (e.g. i've similar images when trying to display an untuned TV-input, which is perfectly OK)

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