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关于格式转化笔记 ffmpeg -i 输入视频.mp4 -r 24 -ac 0 输出视频.webm -i 表示输入 -r set frame rate -acSet the number of audio channels. For output streams it is set by default to the number of input audio channels. For input streams this option only makes sense for audio g.

1.官网下载官网； 2.解压到固定目录D:\Program Files\ffmpeg 3.设置系统环境变量D:\Program Files\ffmpeg\ffmpeg1\bin 4.cmd ffmpeg -version 测试一下

for %i in (*.mp4) do ffmpeg -i "%i" "%i.mp3"