increase fps

app.py

@@ -43,7 +43,7 @@ def extract_waveform_animation(audio_file, window_seconds=5):
                        init_func=init, interval=7, blit=False)
     
     with tempfile.NamedTemporaryFile(delete=False, suffix='.mp4') as tmpfile:
-        ani.save(tmpfile.name, writer='ffmpeg', fps=1)
+        ani.save(tmpfile.name, writer='ffmpeg', fps=30)
         video_path = tmpfile.name
     
     return video_path