diff --git a/src/Extension/H264Rtmp.cpp b/src/Extension/H264Rtmp.cpp
index 97981343..88e926b2 100644
--- a/src/Extension/H264Rtmp.cpp
+++ b/src/Extension/H264Rtmp.cpp
@@ -185,7 +185,7 @@ void H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
         }
     }
 
-    if(_lastPacket && _lastPacket->time_stamp != frame->dts()) {
+    if(_lastPacket && (_lastPacket->time_stamp != frame->dts() || type == H264Frame::NAL_B_P)) {
         RtmpCodec::inputRtmp(_lastPacket);
         _lastPacket = nullptr;
     }
@@ -216,6 +216,10 @@ void H264RtmpEncoder::inputFrame(const Frame::Ptr &frame) {
     _lastPacket->buffer.append((char *) &size, 4);
     _lastPacket->buffer.append(pcData, iLen);
     _lastPacket->body_size = _lastPacket->buffer.size();
+    if (type == H264Frame::NAL_B_P) {
+        RtmpCodec::inputRtmp(_lastPacket);
+        _lastPacket = nullptr;
+    }
 }
 
 void H264RtmpEncoder::makeVideoConfigPkt() {