OGG 转 Opus
把 OGG Vorbis 文件升级成它的后继者 Opus，同等音质下体积更小。
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OGG
A free, open audio format using the Vorbis codec. Popular in games and open-source software.
Opus
The most efficient audio codec available, built for the modern web. Excellent quality even at very low bitrates.