vidocapture BA81

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he, I work on linux 3.15 kernel, opencv 2.4.9 and i use v4l lib and cam in BA81 format. there is a simplest way to use videocapture for gram from cam in BA81 format?(SBGGR v4l format).... actually opencv return my this error:

libv4l2: error set_fmt gave us a different result then try_fmt!
HIGHGUI ERROR: libv4l unable convert to requested pixfmt
libv4l2: error set_fmt gave us a different result then try_fmt!

thanks for any helps.