Use software decoder by default

MediaClient/media/rtsp_player.cpp

@@ -258,7 +258,15 @@ void CRtspPlayer::stop()
     // Set flags BEFORE stopping decoder so TCP rx thread stops calling decode()
     m_bPlaying = FALSE;
     m_bPaused = FALSE;
-    CVideoPlayer::StopVideoDecoder(); // Stop the video decoder
+    CVideoPlayer::StopVideoDecoder(); // Stop the video decoder + uninit (free VRAM)
+
+    // Close RTSP connection and shut down RX threads.
+    // Without this, stopped cameras keep TCP/UDP threads running,
+    // sockets open, and receiving network data — wasting CPU and
+    // network resources. With 100 cameras and only 5 running,
+    // 95 idle threads would consume CPU for no purpose.
+    // Start() → Setup() → open() will reconnect when needed.
+    m_rtsp.rtsp_close();
 }
 
 BOOL CRtspPlayer::pause()