Hi again,
I am sending this patch again (I had missed a check for NULL), could
somebody please have a look at it? 

It is mainly an optimization when the encoder knows in advance that
only portions of the whole frame changed and which areas actually did.

The patch allows a user to pass down information to libx264 information
about which parts of a frame changed (with respect to the preceding
one) to be exploited as a hint for P_SKIP-ing macroblocks which didn't
change. 
This information is encoded in the mb_info field of the x264_param_t
much like the quant_offsets which are already used for the
AV_FRAME_DATA_REGIONS_OF_INTEREST side information.

Best,
Elias




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