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 0911e46..cf714ad 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
+++ b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.java
@@ -128,7 +128,8 @@ public class VideoHandleActivity extends BaseActivity {
                 R.id.btn_to_image,
                 R.id.btn_pip,
                 R.id.btn_moov,
-                R.id.btn_speed
+                R.id.btn_speed,
+                R.id.btn_flv
         );
     }
 
@@ -310,6 +311,14 @@ public class VideoHandleActivity extends BaseActivity {
                 String speed = PATH + File.separator + "speed.mp4";
                 commandLine = FFmpegUtil.changeSpeed(srcFile, speed, 2f, false);
                 break;
+            case R.id.btn_flv://rebuild the keyframe index of flv
+                if (!".flv".equalsIgnoreCase(FileUtil.getFileSuffix(srcFile))) {
+                    Log.e(TAG, "It's not flv file, suffix=" + FileUtil.getFileSuffix(srcFile));
+                    return;
+                }
+                String outputPath = PATH + File.separator + "frame_index.flv";
+                commandLine = FFmpegUtil.buildFlvIndex(srcFile, outputPath);
+                break;
             default:
                 break;
         }
diff --git a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
index 46dd2e1..57d9507 100644
--- a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
+++ b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
@@ -520,4 +520,16 @@ public class FFmpegUtil {
         return speedCmd.split(" ");
     }
 
+    /**
+     * Rebuild the keyframe index of FLV, make it seekable
+     * @param inputFile inputFile
+     * @param targetFile targetFile
+     * @return command of build flv index
+     */
+    public static String[] buildFlvIndex(String inputFile, String targetFile) {
+        String denoiseVideo = "ffmpeg -i %s -flvflags add_keyframe_index %s";
+        denoiseVideo = String.format(denoiseVideo, inputFile, targetFile);
+        return denoiseVideo.split(" ");
+    }
+
 }
diff --git a/app/src/main/res/layout/activity_video_handle.xml b/app/src/main/res/layout/activity_video_handle.xml
index 752d80d..6e4ebe3 100644
--- a/app/src/main/res/layout/activity_video_handle.xml
+++ b/app/src/main/res/layout/activity_video_handle.xml
@@ -128,6 +128,13 @@
                 android:layout_marginTop="4dp"
                 android:text="@string/video_speed"/>
 
+            <Button
+                android:id="@+id/btn_flv"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="4dp"
+                android:text="@string/video_flv"/>
+
         </LinearLayout>
     </ScrollView>
 
diff --git a/app/src/main/res/values-en/strings.xml b/app/src/main/res/values-en/strings.xml
index 5a19e6b..abd0663 100644
--- a/app/src/main/res/values-en/strings.xml
+++ b/app/src/main/res/values-en/strings.xml
@@ -43,6 +43,7 @@
     <string name="video_preview">Video preview</string>
     <string name="video_moov">MOOV move ahead</string>
     <string name="video_speed">Playing speed</string>
+    <string name="video_flv">FLV index</string>
 
     <string name="swap">Swap</string>
     <string name="start">Start</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2bda7e7..aff0ab2 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -43,6 +43,7 @@
     <string name="video_preview">播放预览</string>
     <string name="video_moov">MOOV前移</string>
     <string name="video_speed">播放倍率</string>
+    <string name="video_flv">FLV索引</string>
 
     <string name="swap">切换</string>
     <string name="start">开始</string>