diff --git a/src/RtmpCodec/AACRtmpCodec.cpp b/src/RtmpCodec/AACRtmpCodec.cpp
index 6ac02098..28c0dbbd 100644
--- a/src/RtmpCodec/AACRtmpCodec.cpp
+++ b/src/RtmpCodec/AACRtmpCodec.cpp
@@ -64,6 +64,8 @@ void AACRtmpEncoder::inputFrame(const Frame::Ptr &frame) {
 
     if(!_aac_cfg.empty()){
         RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
+        rtmpPkt->strBuf.clear();
+
         //////////header
         uint8_t is_config = false;
         rtmpPkt->strBuf.push_back(_ui8AudioFlags);
@@ -110,6 +112,8 @@ void AACRtmpEncoder::makeAudioConfigPkt() {
     _ui8AudioFlags = (flvAudioType << 4) | (flvSampleRate << 2) | (flvSampleBit << 1) | flvStereoOrMono;
 
     RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
+    rtmpPkt->strBuf.clear();
+
     //////////header
     uint8_t is_config = true;
     rtmpPkt->strBuf.push_back(_ui8AudioFlags);
diff --git a/src/RtmpCodec/H264RtmpCodec.cpp b/src/RtmpCodec/H264RtmpCodec.cpp
index e46932ec..76357f6e 100644
--- a/src/RtmpCodec/H264RtmpCodec.cpp
+++ b/src/RtmpCodec/H264RtmpCodec.cpp
@@ -123,6 +123,8 @@ void H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
             flags |= ((keyFrame ? FLV_KEY_FRAME : FLV_INTER_FRAME) << 4);
 
             RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
+            rtmpPkt->strBuf.clear();
+
             rtmpPkt->strBuf.push_back(flags);
             rtmpPkt->strBuf.push_back(!is_config);
             rtmpPkt->strBuf.append("\x0\x0\x0", 3);
@@ -151,6 +153,8 @@ void H264RtmpEncoder::makeVideoConfigPkt() {
     bool is_config = true;
 
     RtmpPacket::Ptr rtmpPkt = ResourcePoolHelper<RtmpPacket>::obtainObj();
+    rtmpPkt->strBuf.clear();
+
     //////////header
     rtmpPkt->strBuf.push_back(flags);
     rtmpPkt->strBuf.push_back(!is_config);