diff --git a/app/src/main/java/com/frank/ffmpeg/FFmpegCmd.java b/app/src/main/java/com/frank/ffmpeg/FFmpegCmd.java
index 54fb259..bb73dbe 100644
--- a/app/src/main/java/com/frank/ffmpeg/FFmpegCmd.java
+++ b/app/src/main/java/com/frank/ffmpeg/FFmpegCmd.java
@@ -156,6 +156,9 @@ public class FFmpegCmd {
     public static void onProgressCallback(int position, int duration, @FFmpegState int state) {
         Log.e("FFmpegCmd", "onProgress position=" + position
                 + "--duration=" + duration + "--state=" + state);
+        if (position > duration && duration > 0) {
+            return;
+        }
         if (mProgressListener != null) {
             if (position > 0 && duration > 0) {
                 int progress = position * 100 / duration;
diff --git a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
index 3fde110..bc1f5bb 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
+++ b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
@@ -222,8 +222,8 @@ public class VideoHandleActivity extends BaseActivity {
                 break;
             case R.id.btn_generate_gif://convert video into gif
                 String Video2Gif = PATH + File.separator + "Video2Gif.gif";
-                int gifStart = 30;
-                int gifDuration = 10;
+                int gifStart = 10;
+                int gifDuration = 6;
                 int width = 320;
                 int frameRate = 10;
                 String palettePath = PATH + "/palette.png";
diff --git a/gif/preview.gif b/gif/preview.gif
index 3b8ab23..d045988 100644
Binary files a/gif/preview.gif and b/gif/preview.gif differ