Update app.py

app.py

@@ -27,9 +27,10 @@ def predict(midi_file=None, midi_synth=None, prompt="", neg_prompt="", duration=
         midi_file = midi_file.name
     midi = PrettyMIDI(midi_file)
     if not duration or duration == 0:
-        print("Duration", duration)
         duration = midi_synth[1].shape[0]/SAMPLE_RATE
-        print("New duration", duration)
+        print("Getting duration from MIDI", duration)
+    if not prompt  and not neg_prompt:
+        guess_mode = True
     audio = pipe(
         prompt,
         negative_prompt=neg_prompt,