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https://github.com/librosa/librosa (According to their own page, though: "librosa uses soundfile and audioread to load audio files. Note that soundfile does not currently support MP3, which will cause librosa to fall back on the audioread library". This basically means that in-buffer reading isn't supported for MP3 files. They even recommend you to install ffmpeg or GStreamer so that audioread can work for MP3, too. I'm not exactly sure what they do internally but I assume it's something like: Convert MP3 to WAV using ffmpeg, then using audioread, but this is only an assumption)
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