From 05be6476cad9f03be0ec23ab7a6db79c6233b581 Mon Sep 17 00:00:00 2001
From: jaywcjlove <398188662@qq.com>
Date: Wed, 2 Nov 2022 22:07:01 +0800
Subject: [PATCH] doc: update `ffmpeg.md` (#18).

---
 docs/ffmpeg.md | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/docs/ffmpeg.md b/docs/ffmpeg.md
index 70e70c7f..f07f5286 100644
--- a/docs/ffmpeg.md
+++ b/docs/ffmpeg.md
@@ -3,9 +3,38 @@ FFmpeg 备忘清单
 
 本备忘清单是 [FFmpeg](https://ffmpeg.org/) 中常见视频处理操作的备忘清单
 
-参数参考
+FFmpeg 参考
 ---
 
+### 安装
+
+Linux
+
+```
+$ apt-get install ffmpeg
+$ yum install ffmpeg
+```
+
+MacOS
+
+```bash
+$ brew install ffmpeg
+```
+
+### 示例
+
+mp4 转 avi:
+
+```bash
+$ ffmpeg -i input.mp4 output.avi
+```
+
+webm 转 mp4:
+
+```bash
+$ ffmpeg -i movie.webm movie.mp4
+```
+
 ### 常用开关
 
 ```bash