Update app.py

app.py

@@ -14,8 +14,6 @@ def read_motion_csv(csv_filename):
     
     Returns:
         A dictionary mapping frame numbers to (dx, dy) offsets.
-        The offsets are the negative cumulative displacements,
-        which can be used to counteract the camera motion.
     """
     motion_data = {}
     cumulative_dx = 0.0
@@ -106,11 +104,21 @@ def process_video(video_file, csv_file, zoom):
     Accepts an input video file, a motion CSV file, and a zoom factor.
     Returns the original video and the stabilized video.
     """
-    # Convert input file objects to file paths if needed
+    # Ensure the video file is provided
+    if video_file is None:
+        raise ValueError("Please upload a video file.")
+    
+    # Convert file inputs to file paths if they come as dictionaries
     if isinstance(video_file, dict):
-        video_file = video_file["name"]
+        video_file = video_file.get("name", None)
     if isinstance(csv_file, dict):
-        csv_file = csv_file["name"]
+        csv_file = csv_file.get("name", None)
+    
+    # Check that both file paths are available
+    if video_file is None:
+        raise ValueError("Video file path is missing.")
+    if csv_file is None:
+        raise ValueError("CSV file path is missing. Please upload a CSV file.")
     
     stabilized_path = stabilize_video_using_csv(video_file, csv_file, zoom=zoom)
     return video_file, stabilized_path