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Normalize audio at 0.5/99.5%iles to clip less

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kris 2023-01-18 21:25:52 +00:00
parent 157d7596d7
commit 6b612ffb0a
1 changed files with 3 additions and 3 deletions
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6
transcoder/audio.py
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@ -64,8 +64,8 @@ class Audio:
def _normalization(self, read_bytes=1024 * 1024 * 10): def _normalization(self, read_bytes=1024 * 1024 * 10):
"""Read first read_bytes of audio stream and compute normalization. """Read first read_bytes of audio stream and compute normalization.
We compute the 2.5th and 97.5th percentiles i.e. only 2.5% of samples We normalize based on the 0.5th and 99.5th percentiles, i.e. only <1% of
will clip. samples will clip.
:param read_bytes: :param read_bytes:
:return: :return:
@ -77,7 +77,7 @@ class Audio:
if len(raw) > read_bytes: if len(raw) > read_bytes:
break break
a = self._decode(f, raw) a = self._decode(f, raw)
norm = np.max(np.abs(np.percentile(a, [2.5, 97.5]))) norm = np.max(np.abs(np.percentile(a, [0.5, 99.5])))
return 16384. / norm return 16384. / norm