Many shady download sites take a standard 128 kbps YouTube audio rip or a 320 kbps MP3 and use audio software to re-encode (upconvert) it into a FLAC file container.
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FLAC stands for Free Lossless Audio Codec. Unlike the ubiquitous MP3 format, which uses "lossy" compression to reduce file size by discarding audio data deemed beyond human hearing, FLAC reduces file size without losing any data from the original source. Many shady download sites take a standard 128