doc: update ffmpeg.md (#413)

update:
视频参数
-crf
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MackGg 2023-08-16 10:37:03 +08:00 committed by GitHub
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@ -84,6 +84,7 @@ $ ffmpeg -i movie.webm movie.mp4
`-r RATE` | 每秒帧率
`-s WIDTHxHEIGHT` | 帧大小
`-vn` | 没有视频
`-crf` | 指定编码的质量,数值越大压缩越高,一般范围是 18-28
### 码率设置