diff --git a/src/Rtmp/RtmpDemuxer.cpp b/src/Rtmp/RtmpDemuxer.cpp
index 81ae4e2a..818b0af5 100644
--- a/src/Rtmp/RtmpDemuxer.cpp
+++ b/src/Rtmp/RtmpDemuxer.cpp
@@ -45,9 +45,6 @@ RtmpDemuxer::RtmpDemuxer(const AMFValue &val) {
     }
 }
 
-int RtmpDemuxer::getTrackCount(const AMFValue &metadata) {
-    return (int)(metadata["videocodecid"].type() != AMF_NULL) + (int)(metadata["audiocodecid"].type() != AMF_NULL);
-}
 
 bool RtmpDemuxer::inputRtmp(const RtmpPacket::Ptr &pkt) {
     switch (pkt->typeId) {
diff --git a/src/Rtmp/RtmpDemuxer.h b/src/Rtmp/RtmpDemuxer.h
index 8d828bb1..64ef1cf5 100644
--- a/src/Rtmp/RtmpDemuxer.h
+++ b/src/Rtmp/RtmpDemuxer.h
@@ -55,14 +55,6 @@ public:
 	RtmpDemuxer(const AMFValue &val);
 	virtual ~RtmpDemuxer(){};
 
-	/**
-	 *
-	 * 获取rtmp track 数
-	 * @param metadata rtmp的metadata
-	 * @return
-	 */
-	static int getTrackCount(const AMFValue &metadata);
-
 	/**
 	 * 开始解复用
 	 * @param pkt rtmp包
diff --git a/src/Rtmp/RtmpToRtspMediaSource.h b/src/Rtmp/RtmpToRtspMediaSource.h
index 153fc5c6..4d7c864b 100644
--- a/src/Rtmp/RtmpToRtspMediaSource.h
+++ b/src/Rtmp/RtmpToRtspMediaSource.h
@@ -53,16 +53,22 @@ public:
                           const string &app,
                           const string &id,
 						  int ringSize = 0) : RtmpMediaSource(vhost, app, id,ringSize){
-		_demuxer = std::make_shared<RtmpDemuxer>();
 	}
 	virtual ~RtmpToRtspMediaSource(){}
 
 	void onGetMetaData(const AMFValue &metadata) override {
-		_demuxer = std::make_shared<RtmpDemuxer>(metadata);
+		if(!_demuxer){
+			//在未调用onWrite前，设置Metadata能触发生成RtmpDemuxer
+			_demuxer = std::make_shared<RtmpDemuxer>(metadata);
+		}
 		RtmpMediaSource::onGetMetaData(metadata);
 	}
 
 	void onWrite(const RtmpPacket::Ptr &pkt,bool key_pos = true) override {
+		if(!_demuxer){
+			//尚未获取Metadata，那么不管有没有Metadata，都生成RtmpDemuxer
+			_demuxer = std::make_shared<RtmpDemuxer>();
+		}
 		_demuxer->inputRtmp(pkt);
 		if(!_muxer && _demuxer->isInited(2000)){
 			_muxer = std::make_shared<MultiMediaSourceMuxer>(getVhost(),