diff --git a/src/Common/Device.cpp b/src/Common/Device.cpp
index 450ed9e3..39a76825 100644
--- a/src/Common/Device.cpp
+++ b/src/Common/Device.cpp
@@ -110,6 +110,7 @@ void DevChannel::inputH264(const char* pcData, int iDataLen, uint32_t dts,uint32
 	frame->ptsStamp = pts;
 	frame->buffer.assign("\x00\x00\x00\x01",4);
 	frame->buffer.append(pcData + prefixeSize, iDataLen - prefixeSize);
+	frame->iPrefixSize = 4;
     inputFrame(frame);
 }
 
@@ -134,6 +135,7 @@ void DevChannel::inputH265(const char* pcData, int iDataLen, uint32_t dts,uint32
 	frame->ptsStamp = pts;
 	frame->buffer.assign("\x00\x00\x00\x01",4);
 	frame->buffer.append(pcData + prefixeSize, iDataLen - prefixeSize);
+	frame->iPrefixSize = 4;
 	inputFrame(frame);
 }