MP3 转 OGG
把 MP3 转成 OGG Vorbis，供游戏、开源应用以及基于自由格式搭建的平台使用。
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MP3
The universal audio format. Small files that play on every device, app, and player made in the last two decades.
OGG
A free, open audio format using the Vorbis codec. Popular in games and open-source software.