evmlmotion fps auto adapting

opencv-motion-detect/evmlmotion.cpp

@@ -501,15 +501,18 @@ private:
                 //     this->schmittriStatus = 0;
                 // }
                 static long long called = 0;
+                static int factor = 0;
                 called++;
-                int factor = 0;
                 bool proc = true;
-                if(this->pps != 0) {
+                if(this->pps != 0 && factor == 0) {
+                    // lock the value
                     factor = int(int(this->pps) / this->detPara.fpsProc); // regulator to 0 if it was set inresonably high
                 }
+                
                 if(factor != 0 ){
                     if(called % factor == 0) {
                         proc = true;
+                        factor = 0; // reset it open to change
                     }else{
                         proc = false;
                     }