diff --git a/main.py b/main.py
index e186a25..9ef4643 100644
--- a/main.py
+++ b/main.py
@@ -492,20 +492,32 @@ class MediaGrader:
             
         # Safety check for huge videos
         safe_frame_count = max(1, int(self.total_frames * 0.6))
-        estimated_mb = safe_frame_count * 5 // 1024  # Rough estimate: 5MB per frame
         
-        if safe_frame_count > 5000:  # ~3 minutes at 30fps
-            print(f"Video too large for preloading! {safe_frame_count} frames would use ~{estimated_mb}GB RAM")
-            print("Multi-segment mode not available for videos longer than ~3 minutes")
+        # Calculate actual memory usage based on frame dimensions
+        frame_width = int(self.current_cap.get(cv2.CAP_PROP_FRAME_WIDTH))
+        frame_height = int(self.current_cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
+        bytes_per_frame = frame_width * frame_height * 3  # RGB (3 bytes per pixel)
+        total_bytes = safe_frame_count * bytes_per_frame
+        total_mb = total_bytes / (1024 * 1024)
+        total_gb = total_mb / 1024
+        
+        # Memory-based limits (not frame count)
+        if total_gb > 8:  # 8GB limit
+            print(f"Video too large for preloading!")
+            print(f"  Resolution: {frame_width}x{frame_height}")
+            print(f"  Frames: {safe_frame_count} frames would use {total_gb:.1f}GB RAM")
+            print(f"Multi-segment mode not available for videos requiring >8GB RAM")
             return
-        elif safe_frame_count > 1000:  # Warn for videos > ~30 seconds
-            print(f"Large video detected: {safe_frame_count} frames will use ~{estimated_mb}MB RAM")
+        elif total_mb > 500:  # 500MB warning
+            print(f"Large video detected:")
+            print(f"  Resolution: {frame_width}x{frame_height}")
+            print(f"  Memory: {safe_frame_count} frames will use {total_mb:.0f}MB RAM")
             print("Press any key to continue or 'q' to cancel...")
             # Note: In a real implementation, you'd want proper input handling here
             
         start_time = time.time()
         print(f"Setting up {self.segment_count} segments with video preloading...")
-        print(f"Will preload {safe_frame_count} frames (~{safe_frame_count * 5 // 1024}MB RAM)")
+        print(f"Will preload {safe_frame_count} frames ({frame_width}x{frame_height}) = {total_mb:.0f}MB RAM")
         
         try:
             print("Cleaning up existing captures...")