diff --git a/src/Common/MediaSink.cpp b/src/Common/MediaSink.cpp
index 13b9ab40..02bf904a 100644
--- a/src/Common/MediaSink.cpp
+++ b/src/Common/MediaSink.cpp
@@ -13,19 +13,21 @@
 //最多等待未初始化的Track 10秒，超时之后会忽略未初始化的Track
 #define MAX_WAIT_MS_READY 10000
 
-//如果添加Track，最多等待3秒
-#define MAX_WAIT_MS_ADD_TRACK 3000
-
+//如果添加Track，最多等待5秒
+#define MAX_WAIT_MS_ADD_TRACK 5000
 
 namespace mediakit{
 
 void MediaSink::addTrack(const Track::Ptr &track_in) {
     lock_guard<recursive_mutex> lck(_mtx);
+    if (_all_track_ready) {
+        WarnL << "all track is ready, add this track too late!";
+        return;
+    }
     //克隆Track，只拷贝其数据，不拷贝其数据转发关系
     auto track = track_in->clone();
     auto codec_id = track->getCodecId();
     _track_map[codec_id] = track;
-    _all_track_ready = false;
     _track_ready_callback[codec_id] = [this, track]() {
         onTrackReady(track);
     };
diff --git a/src/Rtp/RtpServer.cpp b/src/Rtp/RtpServer.cpp
index 5b92226b..d417e148 100644
--- a/src/Rtp/RtpServer.cpp
+++ b/src/Rtp/RtpServer.cpp
@@ -25,7 +25,15 @@ RtpServer::~RtpServer() {
 void RtpServer::start(uint16_t local_port, const string &stream_id,  bool enable_tcp, const char *local_ip) {
     //创建udp服务器
     Socket::Ptr udp_server = Socket::createSocket(nullptr, false);
-    if (!udp_server->bindUdpSock(local_port, local_ip)) {
+    if (local_port == 0) {
+        //随机端口，rtp端口采用偶数
+        Socket::Ptr rtcp_server = Socket::createSocket(nullptr, false);
+        auto pair = std::make_pair(udp_server, rtcp_server);
+        makeSockPair(pair, local_ip);
+        //取偶数端口
+        udp_server = pair.first;
+    } else if (!udp_server->bindUdpSock(local_port, local_ip)) {
+        //用户指定端口
         throw std::runtime_error(StrPrinter << "bindUdpSock on " << local_ip << ":" << local_port << " failed:" << get_uv_errmsg(true));
     }
     //设置udp socket读缓存