diff --git a/src/Record/MP4Demuxer.cpp b/src/Record/MP4Demuxer.cpp
index f44265f4..7df9ed27 100644
--- a/src/Record/MP4Demuxer.cpp
+++ b/src/Record/MP4Demuxer.cpp
@@ -22,17 +22,24 @@ namespace mediakit {
 MP4Demuxer::MP4Demuxer() {}
 
 MP4Demuxer::~MP4Demuxer() {
-    _mov_reader = nullptr;
-    closeFile();
+    closeMP4();
 }
 
-void MP4Demuxer::openMP4(const string &file){
-    openFile(file.data(),"rb+");
-    _mov_reader = createReader();
+void MP4Demuxer::openMP4(const string &file) {
+    closeMP4();
+
+    _mp4_file = std::make_shared<MP4FileDisk>();
+    _mp4_file->openFile(file.data(), "rb+");
+    _mov_reader = _mp4_file->createReader();
     getAllTracks();
     _duration_ms = mov_reader_getduration(_mov_reader.get());
 }
 
+void MP4Demuxer::closeMP4() {
+    _mov_reader.reset();
+    _mp4_file.reset();
+}
+
 int MP4Demuxer::getAllTracks() {
     static mov_reader_trackinfo_t s_on_track = {
             [](void *param, uint32_t track, uint8_t object, int width, int height, const void *extra, size_t bytes) {
diff --git a/src/Record/MP4Demuxer.h b/src/Record/MP4Demuxer.h
index 5d19b3a9..9eb64276 100644
--- a/src/Record/MP4Demuxer.h
+++ b/src/Record/MP4Demuxer.h
@@ -16,7 +16,7 @@
 #include "Util/ResourcePool.h"
 namespace mediakit {
 
-class MP4Demuxer : public MP4FileDisk, public TrackSource{
+class MP4Demuxer : public TrackSource {
 public:
     typedef std::shared_ptr<MP4Demuxer> Ptr;
 
@@ -32,6 +32,11 @@ public:
      */
     void openMP4(const string &file);
 
+    /**
+     * @brief 关闭 mp4 文件
+     */
+    void closeMP4();
+
     /**
      * 移动时间轴至某处
      * @param stamp_ms 预期的时间轴位置，单位毫秒
@@ -67,7 +72,8 @@ private:
     Frame::Ptr makeFrame(uint32_t track_id, const Buffer::Ptr &buf, int64_t pts, int64_t dts);
 
 private:
-    Reader _mov_reader;
+    MP4FileDisk::Ptr _mp4_file;
+    MP4FileDisk::Reader _mov_reader;
     uint64_t _duration_ms = 0;
     map<int, Track::Ptr> _track_to_codec;
     ResourcePool<BufferRaw> _buffer_pool;