diff --git a/3rdpart/ZLToolKit b/3rdpart/ZLToolKit
index 3850c1ad..8eaecbd6 160000
--- a/3rdpart/ZLToolKit
+++ b/3rdpart/ZLToolKit
@@ -1 +1 @@
-Subproject commit 3850c1adcc5d184c6da0dd263ac011388bb2ffee
+Subproject commit 8eaecbd6dd8bed0bee6a61168255653127a20a43
diff --git a/src/Rtmp/RtmpMediaSource.h b/src/Rtmp/RtmpMediaSource.h
index e6f9178f..b09bbf53 100644
--- a/src/Rtmp/RtmpMediaSource.h
+++ b/src/Rtmp/RtmpMediaSource.h
@@ -46,6 +46,7 @@
 #include "Thread/ThreadPool.h"
 using namespace toolkit;
 
+#define RTMP_GOP_SIZE 512
 namespace mediakit {
 
 /**
@@ -70,7 +71,7 @@ public:
 	RtmpMediaSource(const string &vhost,
 					const string &app,
 					const string &stream_id,
-					int ring_size = 0) :
+					int ring_size = RTMP_GOP_SIZE) :
 			MediaSource(RTMP_SCHEMA, vhost, app, stream_id), _ring_size(ring_size) {
 	}
 
@@ -146,7 +147,7 @@ public:
 			//rtmp包缓存最大允许512个，如果是纯视频(25fps)大概为20秒数据
 			//但是这个是GOP缓存的上限值，真实的GOP缓存大小等于两个I帧之间的包数的两倍
 			//而且每次遇到I帧，则会清空GOP缓存，所以真实的GOP缓存远小于此值
-			_ring = std::make_shared<RingType>(_ring_size,512,std::move(lam));
+			_ring = std::make_shared<RingType>(_ring_size,std::move(lam));
 			onReaderChanged(0);
 
 			if(_metadata){
diff --git a/src/Rtmp/RtmpMediaSourceImp.h b/src/Rtmp/RtmpMediaSourceImp.h
index 482ad5aa..fca06936 100644
--- a/src/Rtmp/RtmpMediaSourceImp.h
+++ b/src/Rtmp/RtmpMediaSourceImp.h
@@ -54,7 +54,7 @@ public:
 	 * @param id 流id
 	 * @param ringSize 环形缓存大小
 	 */
-	RtmpMediaSourceImp(const string &vhost, const string &app, const string &id, int ringSize = 0) : RtmpMediaSource(vhost, app, id, ringSize) {
+	RtmpMediaSourceImp(const string &vhost, const string &app, const string &id, int ringSize = RTMP_GOP_SIZE) : RtmpMediaSource(vhost, app, id, ringSize) {
 		_demuxer = std::make_shared<RtmpDemuxer>();
 		_demuxer->setTrackListener(this);
 	}
diff --git a/src/Rtsp/RtspMediaSource.h b/src/Rtsp/RtspMediaSource.h
index 21263b9d..a99ee60d 100644
--- a/src/Rtsp/RtspMediaSource.h
+++ b/src/Rtsp/RtspMediaSource.h
@@ -35,17 +35,17 @@
 #include "Common/config.h"
 #include "Common/MediaSource.h"
 #include "RtpCodec.h"
-
 #include "Util/logger.h"
 #include "Util/RingBuffer.h"
 #include "Util/TimeTicker.h"
 #include "Util/ResourcePool.h"
 #include "Util/NoticeCenter.h"
 #include "Thread/ThreadPool.h"
-
 using namespace std;
 using namespace toolkit;
 
+#define RTP_GOP_SIZE 2048
+
 namespace mediakit {
 
 /**
@@ -70,7 +70,7 @@ public:
 	RtspMediaSource(const string &vhost,
 					const string &app,
 					const string &stream_id,
-					int ring_size = 0) :
+					int ring_size = RTP_GOP_SIZE) :
 			MediaSource(RTSP_SCHEMA, vhost, app, stream_id), _ring_size(ring_size) {}
 
 	virtual ~RtspMediaSource() {}
@@ -182,7 +182,7 @@ public:
             //rtp包缓存最大允许2048个，大概最多3MB数据
             //但是这个是GOP缓存的上限值，真实的GOP缓存大小等于两个I帧之间的包数的两倍
             //而且每次遇到I帧，则会清空GOP缓存，所以真实的GOP缓存远小于此值
-			_ring = std::make_shared<RingType>(_ring_size,2048, std::move(lam));
+			_ring = std::make_shared<RingType>(_ring_size, std::move(lam));
 			onReaderChanged(0);
 			if (!_sdp.empty()) {
 				regist();
diff --git a/src/Rtsp/RtspMediaSourceImp.h b/src/Rtsp/RtspMediaSourceImp.h
index e5f78121..4586df2b 100644
--- a/src/Rtsp/RtspMediaSourceImp.h
+++ b/src/Rtsp/RtspMediaSourceImp.h
@@ -45,7 +45,7 @@ public:
 	 * @param id 流id
 	 * @param ringSize 环形缓存大小
 	 */
-    RtspMediaSourceImp(const string &vhost, const string &app, const string &id, int ringSize = 0) : RtspMediaSource(vhost, app, id,ringSize) {
+    RtspMediaSourceImp(const string &vhost, const string &app, const string &id, int ringSize = RTP_GOP_SIZE) : RtspMediaSource(vhost, app, id,ringSize) {
         _demuxer = std::make_shared<RtspDemuxer>();
         _demuxer->setTrackListener(this);
     }
diff --git a/src/Rtsp/RtspPlayerImp.h b/src/Rtsp/RtspPlayerImp.h
index 99b008ed..f61ac7c6 100644
--- a/src/Rtsp/RtspPlayerImp.h
+++ b/src/Rtsp/RtspPlayerImp.h
@@ -72,6 +72,8 @@ private:
 	}
 	void onRecvRTP(const RtpPacket::Ptr &rtp, const SdpTrack::Ptr &track) override {
         if(_pRtspMediaSrc){
+            // rtsp直接代理是无法判断该rtp是否是I帧，所以GOP缓存基本是无效的
+            // 为了减少内存使用，那么我们设置为一直关键帧以便清空GOP缓存
             _pRtspMediaSrc->onWrite(rtp,true);
         }
         _delegate->inputRtp(rtp);