Merge pull request #2997 from mojoritty:bugfix_3767

modules/highgui/src/cap_dshow.cpp

@@ -1825,6 +1825,8 @@ bool videoInput::setVideoSettingCamera(int deviceID, long Property, long lValue,
         hr = VDList[deviceID]->pVideoInputFilter->QueryInterface(IID_IAMCameraControl, (void**)&pIAMCameraControl);
         if (FAILED(hr)) {
             printf("Error\n");
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter->Release();
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter = NULL;
             return false;
         }
         else
@@ -1843,6 +1845,8 @@ bool videoInput::setVideoSettingCamera(int deviceID, long Property, long lValue,
                 pIAMCameraControl->Set(Property, lValue, Flags);
             }
             pIAMCameraControl->Release();
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter->Release();
+            if(VDList[deviceID]->pVideoInputFilter)VDList[deviceID]->pVideoInputFilter = NULL;
             return true;
         }
     }