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

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ANDY 2024-09-30 13:46:54 +10:00 committed by GitHub
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@ -117,6 +117,7 @@ $ ffmpeg -i movie.webm movie.mp4
`-vol` | 以 256 的倍数更改音频音量,其中 256 = 100%(正常)音量。例如 512 = 200%
`-newaudio` | 将新的音频流添加到当前输出流
`-alang code` | 设置当前音频流的 ISO 639 语言代码(3 个字母)
`-ac nTract` | 指定立体声通道数n个声道。例如 nTract = 2 即2个声道
视频编辑
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