diff --git a/README.md b/README.md
index 4d59c3f..cb9b646 100644
--- a/README.md
+++ b/README.md
@@ -33,9 +33,9 @@ android端基于FFmpeg库的使用。<br>
 - #### IjkPlayer的RTSP超低延时直播
 - #### IjkPlayer的RTSP多路投屏直播
 
-左边是ffplay客户端拉流播放，中间是web网页播放：
+拖动进度条预览视频：
 
-![动态图片](https://github.com/xufuji456/FFmpegAndroid/blob/master/gif/live.gif)
+![视频](https://github.com/xufuji456/FFmpegAndroid/blob/master/mp4/preview.mp4)
 
 视频添加文字水印（文字白色背景可以改为透明）：
 
diff --git a/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.java b/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.java
index 4668875..3d833cf 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.java
+++ b/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.java
@@ -129,7 +129,7 @@ public class AudioHandleActivity extends BaseActivity {
                 String concatFile = PATH + File.separator + "concat.mp3";
                 commandLine = FFmpegUtil.concatAudio(srcFile, appendFile, concatFile);
                 break;
-            case R.id.btn_mix://混合
+            case R.id.btn_mix://混音
                 if (!FileUtil.checkFileExist(appendFile)){
                     return;
                 }
diff --git a/mp4/preview.mp4 b/mp4/preview.mp4
new file mode 100644
index 0000000..f0d682d
Binary files /dev/null and b/mp4/preview.mp4 differ