diff --git a/src/N_m3u8DL-RE.Common/Resource/StaticText.cs b/src/N_m3u8DL-RE.Common/Resource/StaticText.cs
index 924b8af..2d296fb 100644
--- a/src/N_m3u8DL-RE.Common/Resource/StaticText.cs
+++ b/src/N_m3u8DL-RE.Common/Resource/StaticText.cs
@@ -242,7 +242,7 @@ namespace N_m3u8DL_RE.Common.Resource
             (
                 zhCN: "所有工作完成时尝试使用ffmpeg混流分离的音视频(默认容器: mkv)",
                 zhTW: "所有工作完成時嘗試使用ffmpeg混流分離的影音(默認容器: mkv)",
-                enUS: "When all works is done, try to use ffmpeg to mux the separated streams.(Default: mkv)"
+                enUS: "When all works is done, try to use ffmpeg to mux the separated streams.(Default container: mkv)"
             ),
             ["cmd_muxToMp4"] = new TextContainer
             (
diff --git a/src/N_m3u8DL-RE/Program.cs b/src/N_m3u8DL-RE/Program.cs
index 990a7db..b8e6d1a 100644
--- a/src/N_m3u8DL-RE/Program.cs
+++ b/src/N_m3u8DL-RE/Program.cs
@@ -55,6 +55,11 @@ namespace N_m3u8DL_RE
                     throw new ArgumentException("Can't use mkvmerge to make mp4!");
                 }
 
+                if (option.MuxToMp4 && !option.MuxAfterDone)
+                {
+                    throw new ArgumentException("Can't enable MuxToMp4 when MuxAfterDone is false!");
+                }
+
                 //预先检查ffmpeg
                 if (option.FFmpegBinaryPath == null)
                     option.FFmpegBinaryPath = GlobalUtil.FindExecutable("ffmpeg");