diff --git a/AndroidMedia/build.gradle b/AndroidMedia/build.gradle
index 181e8fa..81872ac 100644
--- a/AndroidMedia/build.gradle
+++ b/AndroidMedia/build.gradle
@@ -1,8 +1,8 @@
 
 apply plugin: 'com.android.library'
 //apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
diff --git a/app/build.gradle b/app/build.gradle
index 8d259e3..a880e40 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,6 +1,6 @@
 apply plugin: 'com.android.application'
-apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion rootProject.ext.compileSdkVersion
diff --git a/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.kt b/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.kt
index 36e3688..1a82b79 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.kt
+++ b/app/src/main/java/com/frank/ffmpeg/activity/AudioHandleActivity.kt
@@ -261,7 +261,7 @@ class AudioHandleActivity : BaseActivity() {
             12 -> { // audio waveform
                 outputPath = PATH + File.separator + "waveform.png"
                 val resolution = "1280x720"
-                commandLine = FFmpegUtil.showAudioWaveform(srcFile, resolution, outputPath)
+                commandLine = FFmpegUtil.showAudioWaveform(srcFile, resolution, 1, outputPath)
             }
             13 -> { //audio encode
                 val pcmFile = PATH + File.separator + "raw.pcm"
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 7262420..f592cc7 100644
--- a/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
+++ b/app/src/main/java/com/frank/ffmpeg/util/FFmpegUtil.java
@@ -870,9 +870,9 @@ public class FFmpegUtil {
         return insert(trimCmd.split(" "), 2, inputPath, outputPath);
     }
 
-    public static String[] showAudioWaveform(String inputPath, String resolution, String outputPath) {
-        String waveformCmd = "ffmpeg -i -filter_complex showwavespic=s=%s";
-        waveformCmd = String.format(Locale.getDefault(), waveformCmd, resolution);
+    public static String[] showAudioWaveform(String inputPath, String resolution, int splitChannels, String outputPath) {
+        String waveformCmd = "ffmpeg -i -filter_complex showwavespic=s=%s:split_channels=%d";
+        waveformCmd = String.format(Locale.getDefault(), waveformCmd, resolution, splitChannels);
         return insert(waveformCmd.split(" "), 2, inputPath, outputPath);
     }