librosa.load()花费太长时间来加载(采样)mp3文件 [英] librosa.load() takes too long to load(sample) mp3 files

问题描述

我正在尝试使用librosa库通过以下Python代码对mp3文件进行采样(将模拟转换为数字)，但是这会花费太多时间(一个文件大约需要4秒).我怀疑这是因为librosa不支持mp3，因此使用较慢的audioread来采样mp3

I am trying to sample (convert analog to digital) mp3 files via the following Python code using the librosa library, but it takes too much time (around 4 seconds for one file). I suspect this is because librosa doesn't support mp3 and hence uses the slower audioread to sample mp3

代码:

import time
import librosa

s = time.time()
for i in mp3_list[:10]: # list of mp3 file paths, doing for 10 files
    y, sr = librosa.load(i)

print('time taken =', time.time() - s)

time taken = 36.55561399459839

我也收到此警告:

UserWarning: "PySoundFile failed. Trying audioread instead."

显然，对于任何实际应用而言，这都是太多的时间.我想知道是否还有更好的替代方法?

Obviously, this is too much time for any practical application. I want to know if there are better alternatives to this?

为进行比较，对10个相同大小的wav转化进行采样仅花费了大约1.2秒的时间

For comparison, it only took around 1.2 seconds total time to sample 10 same-sized wav conversions

推荐答案

因此，警告类型会提示它. Librosa开发人员在此GitHub问题中解决了类似问题:

So the warning kind of hints it. The Librosa developers addressed a similar question in this GitHub question:

由于libsndfile加载mp3时，始终会出现此警告 目前尚不支持mp3格式.天秤座试图使用 首先是libsndfile，如果失败，它将退回到 audioread程序包，它速度较慢且较脆，但是 支持更多格式.

This warning will always occur when loading mp3 because libsndfile does not (yet/currently) support the mp3 format. Librosa tries to use libsndfile first, and if that fails, it will fall back on the audioread package, which is a bit slower and more brittle, but supports more formats.

这已在 Librosa-code :try ... except RuntimeError ...

因此，在这种情况下，您可以执行自己的直接使用audioread的load()来避免在librosa.load()的第一块中浪费时间，或者可以使用其他库，例如 pydub .或者，您可以使用 ffmpeg 来

So what you can do in this case is either implement your own load() that directly uses audioread to avoid the time wasted in the first block of librosa.load(), or you can use a different library such as pydub. Alternatively, you can use ffmpeg to convert your mp3 to wave before loading them.

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