diff --git a/DownKyi.Core/FFmpeg/FFmpegHelper.cs b/DownKyi.Core/FFmpeg/FFmpegHelper.cs
index 31ae4d3..9b87784 100644
--- a/DownKyi.Core/FFmpeg/FFmpegHelper.cs
+++ b/DownKyi.Core/FFmpeg/FFmpegHelper.cs
@@ -24,7 +24,7 @@ namespace DownKyi.Core.FFmpeg
             }
             if (video2 == null || !File.Exists(video2))
             {
-                param = $"-y -i \"{video1}\" -acodec copy -f aac \"{destVideo}\"";
+                param = $"-y -i \"{video1}\" -acodec copy \"{destVideo}\"";
             }
             if (!File.Exists(video1) && !File.Exists(video2)) { return false; }