Upload your AAC file using the picker above and the converter detects the source type and runs the AAC → WebM pipeline. The result downloads automatically when conversion completes; no account needed for one-off conversions. AAC是高级音频编码,1997年标准化为MPEG-2第7部分,专门设计取代MP3。 WebM是谷歌2010年发表的马特斯卡的严格子集,