Update app.py

app.py

@@ -724,7 +724,16 @@ def process_video_file(video_file, analysis_types):
     st.info(f"Output video will be slowed down to {output_fps:.1f} FPS (60% of original speed) for better visualization.")
     
     # Create video writer with higher quality settings
-    fourcc = cv2.VideoWriter_fourcc(*'mp4v')  # MP4 codec
+    try:
+        # First try H.264 codec (most widely compatible)
+        if cv2.__version__.startswith('4'):
+            fourcc = cv2.VideoWriter_fourcc(*'avc1')  # H.264 codec
+        else:
+            # Fallback to older codec naming
+            fourcc = cv2.VideoWriter_fourcc(*'H264')
+    except Exception:
+        # If H.264 isn't available, fall back to MP4V
+        fourcc = cv2.VideoWriter_fourcc(*'mp4v')
     out = cv2.VideoWriter(output_path, fourcc, output_fps, (width, height), isColor=True)
     
     # Process every Nth frame to reduce API calls but increase from 10 to 5 for more detail