ff_me_cmp_sad 52 libavfilter/motion_estimation.c me_ctx->get_cost = &ff_me_cmp_sad; ff_me_cmp_sad 67 libavfilter/motion_estimation.h uint64_t ff_me_cmp_sad(AVMotionEstContext *me_ctx, int x_mb, int y_mb, int x_mv, int y_mv);