diff --git a/src/nanovg/nanovg-demo.cpp b/src/nanovg/nanovg-demo.cpp
index 8349b4c1e..270649c2f 100644
--- a/src/nanovg/nanovg-demo.cpp
+++ b/src/nanovg/nanovg-demo.cpp
@@ -235,7 +235,7 @@ int main(int argc, char **argv) {
         //The videoFrame is upside-down. Flip. (OpenCL)
         cv::flip(videoFrame, videoFrame, 0);
         //Encode the frame using VAAPI on the GPU.
-        writer.write(videoFrame);
+        writer << videoFrame;
 
         print_fps();
     }
diff --git a/src/optflow/optflow-demo.cpp b/src/optflow/optflow-demo.cpp
index 580ed04a9..7961bb086 100644
--- a/src/optflow/optflow-demo.cpp
+++ b/src/optflow/optflow-demo.cpp
@@ -201,7 +201,7 @@ int main(int argc, char **argv) {
         }
 
         va::bind();
-        writer.write(videoFrame);
+        writer << videoFrame;
 
         print_fps();
     }
diff --git a/src/tetra/tetra-demo.cpp b/src/tetra/tetra-demo.cpp
index 1a76ee98b..ae1440641 100644
--- a/src/tetra/tetra-demo.cpp
+++ b/src/tetra/tetra-demo.cpp
@@ -139,7 +139,7 @@ int main(int argc, char **argv) {
         //Video frame is upside down because the frameBuffer is. -> flip it (OpenCL)
         cv::flip(videoFrame, videoFrame, 0);
         //Encode the frame using VAAPI on the GPU.
-        writer.write(videoFrame);
+        writer << videoFrame;
 
         print_fps();
     }
diff --git a/src/video/video-demo.cpp b/src/video/video-demo.cpp
index 65d67b66e..fa1d6a957 100644
--- a/src/video/video-demo.cpp
+++ b/src/video/video-demo.cpp
@@ -183,7 +183,7 @@ int main(int argc, char **argv) {
         //Video frame is upside down -> flip it (OpenCL)
         cv::flip(videoFrame, videoFrame, 0);
         //Encode the frame using VAAPI on the GPU.
-        writer.write(videoFrame);
+        writer << videoFrame;
 
         print_fps();
     }