diff --git a/src/NVMPI_frameBuf.cpp b/src/NVMPI_frameBuf.cpp
index ddef06e8..3edeb5b9 100644
--- a/src/NVMPI_frameBuf.cpp
+++ b/src/NVMPI_frameBuf.cpp
@@ -8,14 +8,14 @@ bool NVMPI_frameBuf::alloc(NvBufferCreateParams& input_params)
 	ret = NvBufSurf::NvAllocate(&input_params, 1, &dst_dma_fd);
 	if(ret<0)
 	{
-		std::cout << "Failed to allocate buffer" << std::endl;
+		std::cerr << "Failed to allocate buffer" << std::endl;
 		return false;
 	}
 	
 	ret = NvBufSurfaceFromFd(dst_dma_fd, (void**)(&dst_dma_surface));
 	if(ret<0)
 	{
-		std::cout << "Failed to get surface for buffer" << std::endl;
+		std::cerr << "Failed to get surface for buffer" << std::endl;
 		NvBufferDestroy(dst_dma_fd);
 		dst_dma_fd = -1;
 		return false;
@@ -24,7 +24,7 @@ bool NVMPI_frameBuf::alloc(NvBufferCreateParams& input_params)
 	ret = NvBufferCreateEx(&dst_dma_fd, &input_params);
 	if(ret<0)
 	{
-		std::cout << "Failed to allocate buffer" << std::endl;
+		std::cerr << "Failed to allocate buffer" << std::endl;
 		return false;
 	}
 #endif
@@ -40,7 +40,7 @@ bool NVMPI_frameBuf::destroy()
 		ret = NvBufferDestroy(dst_dma_fd);
 		if(ret<0)
 		{
-			std::cout << "Failed to Destroy NvBuffer" << std::endl;
+			std::cerr << "Failed to Destroy NvBuffer" << std::endl;
 			return false;
 		}
 		dst_dma_fd = -1;
diff --git a/src/nvmpi_dec.cpp b/src/nvmpi_dec.cpp
index a3b0366d..b4a2b777 100644
--- a/src/nvmpi_dec.cpp
+++ b/src/nvmpi_dec.cpp
@@ -17,7 +17,7 @@
 #define TEST_ERROR(condition, message, errorCode)    \
 	if (condition)                               \
 {                                                    \
-	std::cout<< message;			     \
+	std::cerr<< message;			     \
 }
 
 using namespace std;
@@ -634,7 +634,7 @@ int nvmpi_decoder_put_packet(nvmpictx* ctx,nvPacket* packet)
 		ret = ctx->dec->output_plane.dqBuffer(v4l2_buf, &nvBuffer, NULL, -1);
 		if (ret < 0)
 		{
-			cout << "Error DQing buffer at output plane" << std::endl;
+			cerr << "Error DQing buffer at output plane" << std::endl;
 			return -1;
 		}
 	}
@@ -650,7 +650,7 @@ int nvmpi_decoder_put_packet(nvmpictx* ctx,nvPacket* packet)
 	ret = ctx->dec->output_plane.qBuffer(v4l2_buf, NULL);
 	if (ret < 0)
 	{
-		std::cout << "Error Qing buffer at output plane" << std::endl;
+		std::cerr << "Error Qing buffer at output plane" << std::endl;
 		ctx->index--;
 		return -2;
 	}
@@ -686,7 +686,7 @@ int copyNvBufToFrame(nvmpictx* ctx, NVMPI_frameBuf *nvmpiBuf, nvFrame* frame)
 #endif
 		if(ret != 0)
 		{
-			printf("NvBufferMap failed \n");
+			fprintf(stderr, "NvBufferMap failed \n");
 			return ret;
 		}
 		
diff --git a/src/nvmpi_enc.cpp b/src/nvmpi_enc.cpp
index 8300dbcb..e11a7075 100644
--- a/src/nvmpi_enc.cpp
+++ b/src/nvmpi_enc.cpp
@@ -13,7 +13,7 @@
 #define TEST_ERROR(condition, message, errorCode)    \
 	if (condition)                               \
 {                                                    \
-	std::cout<< message;                         \
+	std::cerr<< message;                         \
 }
 
 #define OUTPLANE_MEMTYPE_MMAP 0
@@ -67,7 +67,7 @@ static bool encoder_capture_plane_dq_callback(struct v4l2_buffer *v4l2_buf, NvBu
 
 	if (v4l2_buf == NULL)
 	{
-		cout << "Error while dequeing buffer from output plane" << endl;
+		cerr << "Error while dequeing buffer from output plane" << endl;
 		return false;
 	}
 
@@ -88,7 +88,7 @@ static bool encoder_capture_plane_dq_callback(struct v4l2_buffer *v4l2_buf, NvBu
 	{
 		//TODO wait for user to read buffer. make send_frame return AVERROR(EAGAIN) until avcodec_receive_packet() is called
 		//TODO pass warning to avlog
-		printf("[libnvmpi][W]: EAGAIN. User must read output. nvmpi encoder packet memory pool is empty! Packet will be dropped. There may be artifacts in the output video.\n");
+		fprintf(stderr, "[libnvmpi][W]: EAGAIN. User must read output. nvmpi encoder packet memory pool is empty! Packet will be dropped. There may be artifacts in the output video.\n");
 	}
 	else
 	{
@@ -572,7 +572,7 @@ int nvmpi_encoder_put_frame(nvmpictx* ctx,nvFrame* frame)
 		ret = ctx->enc->output_plane.dqBuffer(v4l2_buf, &nvBuffer, NULL, -1);
 		if (ret < 0)
 		{
-			cout << "Error DQing buffer at output plane" << std::endl;
+			cerr << "Error DQing buffer at output plane" << std::endl;
 			return false;
 		}
 	}