added video writer quality, which user may change dynamically in the case of motion jpeg; enabled NEON intrinsics in the encoder

modules/videoio/include/opencv2/videoio.hpp

@@ -376,6 +376,9 @@ enum { CAP_INTELPERC_DEPTH_MAP              = 0, // Each pixel is a 16-bit integ
        CAP_INTELPERC_IMAGE                  = 3
      };
 
+enum { VIDEOWRITER_PROP_QUALITY = 1,    // Quality (0..100%) of the videostream encoded
+       VIDEOWRITER_PROP_FRAMEBYTES = 2, // (Read-only): Size of just encoded video frame
+     };
 
 class IVideoCapture;
 
@@ -642,6 +645,25 @@ public:
      */
     CV_WRAP virtual void write(const Mat& image);
 
+    /** @brief Sets a property in the VideoWriter.
+
+     @param propId Property identifier. It can be one of the following:
+     -   **VIDEOWRITER_PROP_QUALITY** Quality (0..100%) of the videostream encoded. Can be adjusted dynamically in some codecs.
+     @param value Value of the property.
+     */
+    CV_WRAP virtual bool set(int propId, double value);
+
+    /** @brief Returns the specified VideoWriter property
+
+     @param propId Property identifier. It can be one of the following:
+     -   **VIDEOWRITER_PROP_QUALITY** Current quality of the encoded videostream.
+     -   **VIDEOWRITER_PROP_FRAMEBYTES** (Read-only) Size of just encoded video frame; note that the encoding order may be different from representation order.
+
+     **Note**: When querying a property that is not supported by the backend used by the VideoWriter
+     class, value 0 is returned.
+     */
+    CV_WRAP virtual double get(int propId) const;
+
     /** @brief Concatenates 4 chars to a fourcc code
 
     This static method constructs the fourcc code of the codec to be used in the constructor