diff --git a/conf/config.ini b/conf/config.ini
index 9be5e411..ec3a557a 100644
--- a/conf/config.ini
+++ b/conf/config.ini
@@ -284,6 +284,11 @@ segKeep=0
 # If set to 1, the length of the first segment is forcibly set to exactly 1 GOP.
 # When the GOP is smaller than `segDur`, this can improve the initial startup (instant playback) speed.
 fastRegister=0
+
+# fmp4 HLS切片文件的扩展名，例如 .mp4 或 .m4s(fmp4媒体段的标准扩展名)；init段始终为init.mp4，mpegts切片始终为.ts
+# File extension for fMP4 HLS segment files, e.g. .mp4 or .m4s (the standard extension for fMP4 media segments).
+# The init segment is always init.mp4, and mpegts segments are always .ts.
+fmp4SegExt=.mp4
 [hook]
 # 是否启用hook事件，启用后，推拉流都将进行鉴权
 # Whether to enable webhook events. When enabled, pushing and pulling streams requires authentication.
diff --git a/src/Common/config.cpp b/src/Common/config.cpp
index f1774fe7..591e42df 100644
--- a/src/Common/config.cpp
+++ b/src/Common/config.cpp
@@ -355,6 +355,7 @@ const string kFileBufSize = HLS_FIELD "fileBufSize";
 const string kBroadcastRecordTs = HLS_FIELD "broadcastRecordTs";
 const string kDeleteDelaySec = HLS_FIELD "deleteDelaySec";
 const string kFastRegister = HLS_FIELD "fastRegister";
+const string kFmp4SegExt = HLS_FIELD "fmp4SegExt";
 
 static onceToken token([]() {
     mINI::Instance()[kSegmentDuration] = 2;
@@ -366,6 +367,7 @@ static onceToken token([]() {
     mINI::Instance()[kBroadcastRecordTs] = false;
     mINI::Instance()[kDeleteDelaySec] = 10;
     mINI::Instance()[kFastRegister] = false;
+    mINI::Instance()[kFmp4SegExt] = ".mp4";
 });
 } // namespace Hls
 
diff --git a/src/Common/config.h b/src/Common/config.h
index d33b71f7..e3f85844 100644
--- a/src/Common/config.h
+++ b/src/Common/config.h
@@ -531,6 +531,9 @@ extern const std::string kDeleteDelaySec;
 // 如果设置为1，则第一个切片长度强制设置为1个GOP  [AUTO-TRANSLATED:fbbb651d]
 // If set to 1, the length of the first slice is forced to be 1 GOP
 extern const std::string kFastRegister;
+// fmp4 HLS切片文件的扩展名(例如 .mp4 或 .m4s)；mpegts切片始终为.ts
+// File extension for fMP4 HLS segment files (e.g. .mp4 or .m4s); mpegts segments are always .ts
+extern const std::string kFmp4SegExt;
 } // namespace Hls
 
 // //////////Rtp代理相关配置///////////  [AUTO-TRANSLATED:7b285587]
diff --git a/src/Http/HttpConst.cpp b/src/Http/HttpConst.cpp
index 7c1a896c..240057d3 100644
--- a/src/Http/HttpConst.cpp
+++ b/src/Http/HttpConst.cpp
@@ -183,6 +183,7 @@ static const char *s_mime_src[][2] = {
         {"3gp", "video/3gpp"},
         {"ts", "video/mp2t"},
         {"mp4", "video/mp4"},
+        {"m4s", "video/mp4"},
         {"mpeg", "video/mpeg"},
         {"mpg", "video/mpeg"},
         {"mov", "video/quicktime"},
diff --git a/src/Record/HlsMakerImp.cpp b/src/Record/HlsMakerImp.cpp
index 37e49be2..d5c77665 100644
--- a/src/Record/HlsMakerImp.cpp
+++ b/src/Record/HlsMakerImp.cpp
@@ -31,13 +31,16 @@ std::string getDelayPath(const std::string& originalPath) {
 }
 
 HlsMakerImp::HlsMakerImp(bool is_fmp4, const string &m3u8_file, const string &params, uint32_t bufSize, float seg_duration,
-                         uint32_t seg_number, bool seg_keep) : HlsMaker(is_fmp4, seg_duration, seg_number, seg_keep) {
+                         uint32_t seg_number, bool seg_keep, const string &fmp4_seg_ext) : HlsMaker(is_fmp4, seg_duration, seg_number, seg_keep) {
     _poller = EventPollerPool::Instance().getPoller();
     _path_prefix = m3u8_file.substr(0, m3u8_file.rfind('/'));
     _path_hls = m3u8_file;
     _path_hls_delay = getDelayPath(m3u8_file);
     _params = params;
     _buf_size = bufSize;
+    // 兼容用户配置不带前导点的扩展名(例如 m4s)，统一补上"."  [AUTO-TRANSLATED]
+    // Tolerate user-configured extensions without a leading dot (e.g. m4s) by normalizing to ".m4s"
+    _fmp4_seg_ext = fmp4_seg_ext.empty() ? ".mp4" : (fmp4_seg_ext.front() == '.' ? fmp4_seg_ext : "." + fmp4_seg_ext);
     _file_buf.reset(new char[bufSize], [](char *ptr) { delete[] ptr; });
     _info.folder = _path_prefix;
 }
@@ -151,7 +154,7 @@ string HlsMakerImp::onOpenSegment(uint64_t index) {
         auto strHour = getTimeStr("%H");
         auto strTime = getTimeStr("%M-%S");
         auto current_dir = strDate + "/" + strHour + "/";
-        segment_name = current_dir + strTime + "_" + std::to_string(index) + (isFmp4() ? ".mp4" : ".ts");
+        segment_name = current_dir + strTime + "_" + std::to_string(index) + (isFmp4() ? _fmp4_seg_ext : ".ts");
         segment_path = _path_prefix + "/" + segment_name;
         if (isLive()) {
             // 直播
diff --git a/src/Record/HlsMakerImp.h b/src/Record/HlsMakerImp.h
index aa1b9efe..d1af9a07 100644
--- a/src/Record/HlsMakerImp.h
+++ b/src/Record/HlsMakerImp.h
@@ -22,7 +22,8 @@ namespace mediakit {
 class HlsMakerImp : public HlsMaker {
 public:
     HlsMakerImp(bool is_fmp4, const std::string &m3u8_file, const std::string &params, uint32_t bufSize = 64 * 1024,
-                float seg_duration = 5, uint32_t seg_number = 3, bool seg_keep = false);
+                float seg_duration = 5, uint32_t seg_number = 3, bool seg_keep = false,
+                const std::string &fmp4_seg_ext = ".mp4");
     ~HlsMakerImp() override;
 
     /**
@@ -68,6 +69,7 @@ private:
 private:
     int _buf_size;
     std::string _params;
+    std::string _fmp4_seg_ext;
     std::string _path_hls;
     std::string _path_hls_delay;
     std::string _path_init;
diff --git a/src/Record/HlsRecorder.h b/src/Record/HlsRecorder.h
index 6ed4e78f..21992059 100644
--- a/src/Record/HlsRecorder.h
+++ b/src/Record/HlsRecorder.h
@@ -26,9 +26,10 @@ public:
         GET_CONFIG(bool, hlsKeep, Hls::kSegmentKeep);
         GET_CONFIG(uint32_t, hlsBufSize, Hls::kFileBufSize);
         GET_CONFIG(float, hlsDuration, Hls::kSegmentDuration);
+        GET_CONFIG(std::string, hlsFmp4SegExt, Hls::kFmp4SegExt);
 
         _option = option;
-        _hls = std::make_shared<HlsMakerImp>(is_fmp4, m3u8_file, params, hlsBufSize, hlsDuration, hlsNum, hlsKeep);
+        _hls = std::make_shared<HlsMakerImp>(is_fmp4, m3u8_file, params, hlsBufSize, hlsDuration, hlsNum, hlsKeep, hlsFmp4SegExt);
         // 清空上次的残余文件  [AUTO-TRANSLATED:e16122be]
         // Clear the residual files from the last time
         _hls->clearCache();