Error in accessing device capabilities v4l1 video

If you face accessing error in v4l1 device capabilities on ubunut 12.04

ioctl (deviceHandle, VIDIOCGMBUF, &memoryBuffer) == -1) is this call fails

run the following command and recompile and execute the application .

export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libv4l/v4l1compat.so

 

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