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I just recognized that the bit rate of an audio file compressed in FLAC is changing during play. On the other hand, MP3 file has a fixed bit rate such as 128, 192, 320kbsp etc. But why FLAC is not? Thank you for your time.

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    $\begingroup$ MP3 can also do variable bit rates. Variable bit rates improve compression, because they use less bits when the signal is not changing much. $\endgroup$ – MBaz Nov 26 '15 at 1:36
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    $\begingroup$ and to add to @MBaz, with lossless coding, the bit rate solely depends on the audio content. with lossy coding, you can have changing audio content and a constant bit rate if you're willing to put up with changing audio quality. $\endgroup$ – robert bristow-johnson Nov 26 '15 at 3:27

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