4a9928e5eb
While encoding a frame, its last frame source can be used to give acurate motion information. This patch prevents last frame to be overwritten so that it is available during current frame encoding. The last source is scaled when it is necessary. cpi->Last_Source points to the last source frame. Change-Id: I0e1ef5e9e1d2badf9d0c7a1a44a7ed5b24c09425