diff --git a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.kt b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.kt
index 68ab9de..ba90675 100644
--- a/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.kt
+++ b/app/src/main/java/com/frank/ffmpeg/activity/VideoHandleActivity.kt
@@ -392,7 +392,7 @@ class VideoHandleActivity : BaseActivity() {
         val files = photoFile.listFiles()
         val cmdList = ArrayList<Array<String>>()
         //the resolution of photo which you want to convert
-        val resolution = "640x320"
+        val resolution = "640x480"
         for (file in files) {
             val inputPath = file.absolutePath
             val outputPath = tempPath + file.name
diff --git a/picture/ffmpeg_group.png b/picture/ffmpeg_group.png
index a98634f..4a0a9fb 100644
Binary files a/picture/ffmpeg_group.png and b/picture/ffmpeg_group.png differ