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doc: update docs/ffmpeg.md (#835)
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‎docs/ffmpeg.md‎

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@@ -117,6 +117,7 @@ $ ffmpeg -i movie.webm movie.mp4
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`-vol` | 以 256 的倍数更改音频音量,其中 256 = 100%(正常)音量。例如 512 = 200%
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`-newaudio` | 将新的音频流添加到当前输出流
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`-alang code` | 设置当前音频流的 ISO 639 语言代码(3 个字母)
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`-ac nTract` | 指定立体声通道数(n个声道)。例如 nTract = 2 即2个声道
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视频编辑
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