diff --git a/BilibiliLiveRecordDownLoader/Services/FFmpegLiveStreamRecorder.cs b/BilibiliLiveRecordDownLoader/Services/FFmpegLiveStreamRecorder.cs
index 8426a92..a965c56 100644
--- a/BilibiliLiveRecordDownLoader/Services/FFmpegLiveStreamRecorder.cs
+++ b/BilibiliLiveRecordDownLoader/Services/FFmpegLiveStreamRecorder.cs
@@ -21,7 +21,7 @@ public override async ValueTask DownloadAsync(string outFilePath, CancellationTo
 			throw new InvalidOperationException(@"Do InitializeAsync first");
 		}
 
-		string filePath = Path.ChangeExtension(outFilePath, @".mkv");
+		string filePath = Path.ChangeExtension(outFilePath, @".ts");
 		FileInfo file = new(filePath);
 		file.Directory?.Create();