Opus 转 AAC
把 Opus 音频重新编码成 AAC，供以 AAC 编码为标准的设备和应用使用。
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Opus
The most efficient audio codec available, built for the modern web. Excellent quality even at very low bitrates.
AAC
Raw AAC audio — MP3's successor, used in streaming and broadcasting. Efficient, but fewer apps open bare AAC files.