FLAC 转 Opus
把 FLAC 曲目压缩成 Opus 文件，体积只是原来的零头，音质却依然出色。
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FLAC
Lossless compressed audio — CD quality at roughly half the size of WAV. The archival format of choice for music collections.
Opus
The most efficient audio codec available, built for the modern web. Excellent quality even at very low bitrates.