Fix NV12 crash issue when recreate camera object

MediaClient/media/video_decoder.h

@@ -3,6 +3,7 @@
 #include "sys_inc.h"
 #include "media_format.h"
 #include <string>
+#include <atomic>
 #include <mutex>
 #include <vector>
 extern "C"
@@ -152,7 +153,7 @@ private:
 	int     hwDecoderInit(AVCodecContext* ctx, int hwMode, int preferredGpu = -1);
 private:
 	BOOL			m_bInited;
-	BOOL			m_bRunning;
+	std::atomic<BOOL>	m_bRunning;
 	BOOL			m_bHardwareDecoderEnabled;  // Track if hardware decoder is enabled
 	bool			m_bCudaHWAccel;             // true when using AV_HWDEVICE_TYPE_CUDA
 	int				m_hwGpuIndex;               // GPU index assigned by HWDecoderPool (-1 = legacy)