re-add frames param in animation

app.py

@@ -30,7 +30,7 @@ def extract_waveform_animation(audio_file):
         return line,
     
     # Create the animation
-    ani = FuncAnimation(fig, update, init_func=init, interval=7, blit=False)
+    ani = FuncAnimation(fig, update, frames=np.arange(0, int(duration)), init_func=init, interval=7, blit=False)
     
     # Save the animation to a temporary file
     with tempfile.NamedTemporaryFile(delete=False, suffix='.mp4') as tmpfile: