Writing video data from matlab to dsp dm6446 (H.264 encoder code)

I am trying to transmit live video data from usb camera, so i had to write video frame data captured in matlab to dm6446 using emulator xds560 . the code that I am using in code composer studio is H.264 encoder provided my TI.. I am getting this error:

"memory map prevented reading of target memory at 0x40300000"
i have checked my gel file and tms320dm6446 memory map, this is the location which is reserved memory but the buffer where I try to write my data had memory location 0x82F0000 but just after writing, the memory location changed in that buffer and it displays this error.  and so it does not write any data. Please help me as soon as you get this, I have a deadline to achieve.