Add video format validation

app.py

@@ -1,8 +1,15 @@
 import gradio as gr
+import mimetypes
 
 def process_video(video, visualize_features):
     if video is None:
         return None, "Error: No video uploaded."
+
+    # Validate video format
+    mime_type, _ = mimetypes.guess_type(video)
+    if not mime_type or not mime_type.startswith("video"):
+        return None, "Error: Unsupported file format. Please upload a valid video file."
+
     try:
         # Placeholder: In a real app, process the video and visualize features if requested
         msg = "Feature visualization enabled." if visualize_features else "Feature visualization disabled."
@@ -10,7 +17,7 @@ def process_video(video, visualize_features):
     except Exception as e:
         return None, f"Error: {str(e)}"
 
-with gr.Blocks(theme=gr.themes.Base(), css=".gradio-container {background: #111827; color: #d1d5db;}") as demo:
+with gr.Blocks(theme=gr.themes.Base(), css=".gradio-container {background: #111827; color: #d1d5db;}" ) as demo:
     gr.Markdown(
         """
         # <span style="background: linear-gradient(to right, #2dd4bf, #06b6d4); -webkit-background-clip: text; color: transparent;">DINOv3 Video Tracking</span>