Opus 转 OGG
把 Opus 音频重新打包成 OGG Vorbis，供只认 Vorbis 不认 Opus 的老播放器使用。
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Opus
The most efficient audio codec available, built for the modern web. Excellent quality even at very low bitrates.
OGG
A free, open audio format using the Vorbis codec. Popular in games and open-source software.