Update app.py

app.py

@@ -1,7 +1,24 @@
 import gradio as gr
+import ffmpeg
+import os
 
-def greet(name):
-    return "Hello " + name + "!"
+def extract_audio(video):
+    input_path = video.name
+    out_audio = "audio.wav"
+    (
+        ffmpeg
+        .input(input_path)
+        .output(out_audio, ac=1, ar=16000, format="wav")
+        .overwrite_output()
+        .run(quiet=True)
+    )
+    return out_audio  # returns audio file for download
+
+with gr.Blocks() as demo:
+    gr.Markdown("# Dubbing Prototype: Step 1 (extract audio)")
+    video_in = gr.Video(label="Upload video")
+    audio_out = gr.Audio(label="Extracted audio")
+    btn = gr.Button("Extract audio")
+    btn.click(fn=extract_audio, inputs=video_in, outputs=audio_out)
 
-demo = gr.Interface(fn=greet, inputs="text", outputs="text")
 demo.launch()