diff --git a/src/N_m3u8DL-RE.Common/Resource/ResString.cs b/src/N_m3u8DL-RE.Common/Resource/ResString.cs
index d65babe..5d0da33 100644
--- a/src/N_m3u8DL-RE.Common/Resource/ResString.cs
+++ b/src/N_m3u8DL-RE.Common/Resource/ResString.cs
@@ -10,6 +10,8 @@ namespace N_m3u8DL_RE.Common.Resource
     public class ResString
     {
         public readonly static string ReLiveTs = "<RE_LIVE_TS>";
+        public static string singleFileRealtimeDecryptWarn { get => GetText("singleFileRealtimeDecryptWarn"); }
+        public static string singleFileSplitWarn { get => GetText("singleFileSplitWarn"); }
         public static string customRangeWarn { get => GetText("customRangeWarn"); }
         public static string customRangeFound { get => GetText("customRangeFound"); }
         public static string customAdKeywordsFound { get => GetText("customAdKeywordsFound"); }
diff --git a/src/N_m3u8DL-RE.Common/Resource/StaticText.cs b/src/N_m3u8DL-RE.Common/Resource/StaticText.cs
index e97ce6b..af9d31c 100644
--- a/src/N_m3u8DL-RE.Common/Resource/StaticText.cs
+++ b/src/N_m3u8DL-RE.Common/Resource/StaticText.cs
@@ -10,6 +10,18 @@ namespace N_m3u8DL_RE.Common.Resource
     {
         public static Dictionary<string, TextContainer> LANG_DIC = new()
         {
+            ["singleFileSplitWarn"] = new TextContainer
+            (
+                zhCN: "整段文件已被自动切割为小分片以加速下载",
+                zhTW: "整段文件已被自動切割為小分片以加速下載",
+                enUS: "The entire file has been cut into small segments to accelerate"
+            ),
+            ["singleFileRealtimeDecryptWarn"] = new TextContainer
+            (
+                zhCN: "实时解密已被强制关闭",
+                zhTW: "即時解密已被強制關閉",
+                enUS: "Real-time decryption has been disabled"
+            ),
             ["customRangeWarn"] = new TextContainer
             (
                 zhCN: "请注意，自定义下载范围有时会导致音画不同步",
diff --git a/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs b/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs
index c2225ee..a5b60e4 100644
--- a/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs
+++ b/src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs
@@ -109,7 +109,16 @@ namespace N_m3u8DL_RE.DownloadManager
             if (segments.Count() == 1)
             {
                 var splitSegments = await LargeSingleFileSplitUtil.SplitUrlAsync(segments.First(), DownloaderConfig.Headers);
-                if (splitSegments != null) segments = splitSegments;
+                if (splitSegments != null)
+                {
+                    segments = splitSegments;
+                    Logger.WarnMarkUp($"[darkorange3_1]{ResString.singleFileSplitWarn}[/]");
+                    if (DownloaderConfig.MyOptions.MP4RealTimeDecryption)
+                    {
+                        DownloaderConfig.MyOptions.MP4RealTimeDecryption = false;
+                        Logger.WarnMarkUp($"[darkorange3_1]{ResString.singleFileRealtimeDecryptWarn}[/]");
+                    }
+                }
                 else speedContainer.SingleSegment = true;
             }