Add preview button

app.py

@@ -110,6 +110,7 @@ with demo:
             start_second = gr.Number(label="Select starting point (in seconds) for the transcription",
                                     value=0,
                                     precision=0)
+        preview_btn = gr.Button("Preview")
         with gr.Row().style(mobile_collapse=False, equal_height=True):
             title = gr.Label(label="Video Title", placeholder="Title")
             img = gr.Image(label="Thumbnail")
@@ -117,9 +118,9 @@ with demo:
             yt_audio = gr.Audio()
             yt_audio_path = gr.Textbox(visible=False)
 
-        link.change(fn=populate_metadata,
-                    inputs=[link, start_second],
-                    outputs=[img, title, yt_audio, yt_audio_path])
+        preview_btn.click(fn=populate_metadata,
+                          inputs=[link, start_second],
+                          outputs=[img, title, yt_audio, yt_audio_path])
         
         with gr.Row():
             btn = gr.Button("Transcribe music")