Liu Song’s Projects

diff --git a/docs/en/qa/qa.md b/docs/en/qa/qa.md
index 19be6243210f4bb5a85e2c819261e1ccba212d91..0fde252d1e71041abf78e6b0e490734bdab177b3 100755
--- a/docs/en/qa/qa.md
+++ b/docs/en/qa/qa.md
@@ -37,4 +37,20 @@
 #### Solve
 
 # Common problem
+#### Solve
+
+
+5. #### Why is a 2G cache generated when synthesizing a video of more than one minute?
+
+#### Solve
+
+FFCreator uses raw format cache by default, raw can make the processing speed is fast and the video quality is also very good.
+If your server does not have a large storage space, and you do not have a high demand for processing speed. Then you can set the cache format to save disk space.
+
+- Use `jpg`(or `png`) format cache, Set the `cacheQuality` option to modify the quality.
+> Note: The use of jpg format compared to raw will greatly save the cache space, most of the time it is about one-tenth. the processing speed will be a little bit slower.
+
+```javascript
+cacheType: 'jpg', // (or png)
+cacheQuality: 70, // default 80
 ```




diff --git a/docs/qa/qa.md b/docs/qa/qa.md
index 238cd99ec4dc8baf0b92944b5494615325d79f02..8523e7bee4090d9e180b5089fc26a9f5a9406925 100755
--- a/docs/qa/qa.md
+++ b/docs/qa/qa.md
@@ -37,4 +37,19 @@
 #### 解决
 
 # 常见问题
+#### 解决
+
+5. #### 为什么合成一分钟以上的视频的时候会生成几个G的缓存
+
+#### 解决
+
+FFCreator默认使用的是raw格式缓存，使用raw可以确保处理速度极快并且视频质量也非常好。
+如果你的服务器并没有大的存储空间, 那么您可以通过设置缓存格式来节省磁盘空间。
+
+- 使用`jpg`(or `png`) 格式的缓存，设置`cacheQuality`选项以修改质量。
+> 注：使用jpg格式对比原始将会极大的节省缓存空间，大多时候是十分之一甚至几十分之一。png质量会更好一些但是占用空间也会变大。
+
+```javascript
+cacheType: 'jpg', // (or png)
+cacheQuality: 70, // default 80
 ```