介绍如何通过 JavaScript 编解码 Webm 格式文件，为使用 MediaRecorder 录制的音频添加总时长信息。
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浏览器里面用 MediaRecorder 录制音频生成的 webm 格式的文件没有总时长, 本文通过编解码 Webm 写入 Duration 总时长知乎: https://zhuanlan.zhihu.com/p/667727432掘金: https://juejin.cn/post/7303075105390297099
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