diff --git a/device/mpp/sample/venc/rtp.c b/device/mpp/sample/venc/rtp.c
index c7736e2..315f17b 100644
--- a/device/mpp/sample/venc/rtp.c
+++ b/device/mpp/sample/venc/rtp.c
@@ -163,6 +163,8 @@ int Pack264AndSend(unsigned char *frame,int size,RtspClient * p){
         identifier.FUType = frame[4]&0x1f; //sps or pps
         identifier.NRI = (frame[4]&0xe0)>>5;
         identifier.F = 0;
+        rtspInterleavedFrameHeader.length = htons(size - 5 + sizeof(FuIdentifier) + sizeof(CRtpHeader) );
+
         int index = 0;
         memcpy(sendBuf,&rtspInterleavedFrameHeader,sizeof(rtspInterleavedFrameHeader));
         index += sizeof(rtspInterleavedFrameHeader);
@@ -191,7 +193,8 @@ int Pack264AndSend(unsigned char *frame,int size,RtspClient * p){
 	                    rtspInterleavedFrameHeader.length = htons(MAX_RTP_LEN + sizeof(CH264NalUnit) + sizeof(CRtpHeader));
 	                }else{
 	                    sendLength = (size - 5)%MAX_RTP_LEN + sizeof(CH264NalUnit) + sizeof(CRtpHeader) + sizeof(RtspInterleavedFrameHeader);
-	                    rtspInterleavedFrameHeader.length = htons((size - 5)%MAX_RTP_LEN + sizeof(CH264NalUnit) + sizeof(CRtpHeader));
+						printf("last package send %d length\r\n",sendLength);
+						rtspInterleavedFrameHeader.length = htons((size - 5)%MAX_RTP_LEN + sizeof(CH264NalUnit) + sizeof(CRtpHeader));
 	                }
 	                nalUnit.Header.End = 1;
 	                nalUnit.Header.Start = 0;