Use software decoder by default

MediaClient/media/video_player.h

@@ -148,6 +148,7 @@ public:
     // Image quality mode: 0=fast (OpenCV BT.601, ~2ms), 1=quality (sws BT.709+range, ~12ms)
     virtual void    setImageQuality(int mode) { m_nImageQuality = mode; }
     void            setTargetFPS(double intervalMs);  // Set minimum interval between processed frames in ms (0 = no limit, 100 = ~10 FPS)
+    double          getLastFrameAgeMs();              // Milliseconds since last frame arrived from decoder (0 if no frame yet)
     virtual void    setRtpMulticast(BOOL flag) {}
     virtual void    setRtpOverUdp(BOOL flag) {}
 
@@ -223,6 +224,7 @@ protected:
 
     cv::Mat         avframeAnyToCvmat(const AVFrame* frame);
     cv::Mat         avframeNV12ToCvMat(const AVFrame* frame);
+    cv::Mat         avframeYUV420PToCvMat(const AVFrame* frame);   // YUV420P/YUVJ420P → BGR (OpenCV, no sws_scale)
     cv::Mat         avframeYUVJ420PToCvmat(const AVFrame* frame);
     cv::Mat         avframeToCVMat(const AVFrame* frame);
 
@@ -273,6 +275,12 @@ protected:
     std::chrono::steady_clock::time_point m_lastProcessedTime;  // timestamp of last processed frame
     bool m_targetFPSInitialized = false;                   // first-frame flag
 
+    // Wall-clock timestamp of last frame received from the decoder (NOT from getImage).
+    // Updated in onVideoFrame() for EVERY decoded frame, even rate-limited ones.
+    // Used by LabVIEW to detect truly stale cameras vs rate-limited ones.
+    std::chrono::steady_clock::time_point m_lastDecoderFrameTime;
+    bool m_lastDecoderFrameTimeSet = false;
+
     BOOL            m_bPlaying;
     BOOL            m_bPaused;