Update app.py

app.py

@@ -869,7 +869,7 @@ def on_video_upload(video, image, high_res):
     # Auto-adjust duration to min(video_length, 10)
     vid_dur = _get_video_duration(video)
     if vid_dur is not None:
-        dur = round(min(vid_dur, 10.0), 1)
+        dur = round(min(vid_dur, 15.0), 1)
     else:
         dur = 3.0