diff --git a/vr180_matting/vr180_processor.py b/vr180_matting/vr180_processor.py
index 72d7cd7..3e39c95 100644
--- a/vr180_matting/vr180_processor.py
+++ b/vr180_matting/vr180_processor.py
@@ -170,13 +170,35 @@ class VR180Processor(VideoProcessor):
             for fourcc_str, ext in codecs_to_try:
                 fourcc = cv2.VideoWriter_fourcc(*fourcc_str)
                 temp_video_path_with_ext = temp_video_path.with_suffix(ext)
+                
+                print(f"Trying codec {fourcc_str} with path {temp_video_path_with_ext}")
+                print(f"Video params: size=({width}, {height}), fps=30.0")
+                
                 writer = cv2.VideoWriter(str(temp_video_path_with_ext), fourcc, 30.0, (width, height))
                 
                 if writer.isOpened():
-                    temp_video_path = temp_video_path_with_ext
-                    print(f"Using codec {fourcc_str} for temp video")
-                    break
+                    # Test writing the first frame
+                    test_frame = eye_frames[0].copy()
+                    if test_frame.dtype != np.uint8:
+                        test_frame = test_frame.astype(np.uint8)
+                    if not test_frame.flags['C_CONTIGUOUS']:
+                        test_frame = np.ascontiguousarray(test_frame)
+                    
+                    test_success = writer.write(test_frame)
+                    print(f"Test write with {fourcc_str}: {'SUCCESS' if test_success else 'FAILED'}")
+                    
+                    if test_success:
+                        temp_video_path = temp_video_path_with_ext
+                        print(f"Using codec {fourcc_str} for temp video")
+                        # Reset writer to start fresh
+                        writer.release()
+                        writer = cv2.VideoWriter(str(temp_video_path_with_ext), fourcc, 30.0, (width, height))
+                        break
+                    else:
+                        writer.release()
+                        writer = None
                 else:
+                    print(f"Failed to open writer with {fourcc_str}")
                     writer.release()
                     writer = None