MP3 转 AAC
把 MP3 音频转成 AAC，供想用更新编码格式的设备和流媒体服务使用。
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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.
AAC
Raw AAC audio — MP3's successor, used in streaming and broadcasting. Efficient, but fewer apps open bare AAC files.