javascript video to audio
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use FileReader to load an video, and decodeAudioData to decode it and OfflineAudioContext to render it, at last, audiobuffer to wav;
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reference：https://github.com/mdn/webaudio-examples/tree/master/offline-audio-context-promise;
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audiobuffer-to-wav：https://github.com/Jam3/audiobuffer-to-wav;