不支持G.711的音频 #749
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用了0.4.4和0.4 版本，发现都不支持G.711，这个ffmpeg应该很早就支持，为什么这里不支持呢？而iOS平台本身的解码器也不支持G.711，导致彻底无法使用。 由于国外版权原因很多APP不能使用AAC，所以希望能支持下
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