Fix len song

ipi_extract.py

@@ -39,6 +39,8 @@ def load_file(in_path, channel, low, high):
     song = song[:, channel]
     sos = sg.butter(3, [low, high], 'bandpass', fs=sr, output='sos')
     song = sg.sosfiltfilt(sos, song)
+    if len(song) < 20*sr:
+        song = np.pad(song, (1, 20*sr), mode='constant')
     frac = Fraction(FSSR, sr)
     song_resample = sg.resample_poly(song, frac.numerator, frac.denominator)
     print('Done processing')