Update app.py

app.py

@@ -27,14 +27,17 @@ Audio events are actually the entire scene description based only on the audio o
 """
 
 def trim_video(input_path, max_duration=10):
-    video_clip = VideoFileClip(input_path)
-    output_path = "video_cut_10.mp4"
-    if video_clip.duration > max_duration:
-        trimmed_clip = video_clip.subclip(0, max_duration)
-        trimmed_clip.write_videofile(output_path, audio_codec='aac')
-        return output_path
-    else:
-        return input_path
+    if input_path is not None:
+        video_clip = VideoFileClip(input_path)
+        output_path = "video_cut_10.mp4"
+        if video_clip.duration > max_duration:
+            trimmed_clip = video_clip.subclip(0, max_duration)
+            trimmed_clip.write_videofile(output_path, audio_codec='aac')
+            return output_path
+        else:
+            return input_path
+    else :
+        return None
 
 def extract_frames(video_in, output_format='.jpg'):
     # Adjust interval to video length
@@ -240,7 +243,7 @@ with gr.Blocks(css=css) as demo :
                 submit_btn = gr.Button("Submit")
                 video_description = gr.Textbox(label="Video description", elem_id="video-text")
     
-    video_in.input(
+    video_in.change(
         fn = trim_video,
         inputs = [video_in],
         outputs = [video_cut],