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Why are 128kbit/s MP3s usually 44,100 Hz?
post Oct 14 2012, 01:44
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Since 128kbit/s MP3s usually has a low-pass filter at 16,000 Hz, and the Nyquist-Shannon theorem states that all frequencies under f/2 Hz can be totally described at an f Hz sampling rate, why not encode at 32,000 Hz? Wouldn't it save more space?
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post Oct 14 2012, 08:12
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Compreession is more effective when using 32 kHz. Quality of tonal parts of the music improves. However pre-echo issues get worse, and you don't necessarily have a 16 kHz lowpass when using 128 kbps mp3 (though staying below 16 kHz is very adequate at this bitrate).

lame3100m -V1 --insane_factor 0.75
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