concurrency fix

app.py

@@ -27,19 +27,18 @@ with gr.Blocks() as demo:
                 model_dropdown.render()
                 # summary_checkbox.render()
         start_button.render()
-        start_button.click(prepare_input,
-                           [input_video, start_time, end_time, lang_radio,
-                               model_dropdown],
-                           [output_transcribe, output_file])
+        (
+            start_button
+            .click(prepare_input, [input_video, start_time, end_time, lang_radio, model_dropdown], [output_transcribe, output_file])
+            .then(prepare_output, inputs=input_video, outputs=[adjust_speaker, adjust_audio, prev_button, next_button, adjust_button])
+            .then(prepare_video_subtitle, inputs=[input_video, start_time, end_time], outputs=output_video)
+        )
 
     bottom_markdown.render()
     with gr.Row(equal_height=False):
         with gr.Column():
             output_video.render()
             output_file.render()
-            output_file.change(prepare_output, inputs=input_video, outputs=[
-                adjust_speaker, adjust_audio, prev_button, next_button, adjust_button]).then(prepare_video_subtitle, inputs=[
-                    input_video, start_time, end_time], outputs=output_video)
 
         with gr.Column():
             output_transcribe.render()
@@ -58,8 +57,11 @@ with gr.Blocks() as demo:
                           adjust_speaker, adjust_audio])
 
     adjust_button.render()
-    adjust_button.click(start_adjust, inputs=[input_video, adjust_speaker], outputs=[output_transcribe, output_file]).then(
-        start_adjust_subtitle, inputs=[input_video, start_time, end_time], outputs=output_video)
+    (
+        adjust_button
+        .click(start_adjust, inputs=[input_video, adjust_speaker], outputs=[output_transcribe, output_file])
+        .then(start_adjust_subtitle, inputs=[input_video, start_time, end_time], outputs=output_video)
+    )
 
     with gr.Accordion("Copyright"):
         gr.Markdown("Created with OpenAI Whisper and Huggingface")