diff --git a/src/Common/Device.cpp b/src/Common/Device.cpp
index 6dabebef..67ab696e 100644
--- a/src/Common/Device.cpp
+++ b/src/Common/Device.cpp
@@ -84,10 +84,21 @@ void DevChannel::inputPCM(char* pcData, int iDataLen, uint32_t uiStamp) {
 }
 #endif //ENABLE_FAAC
 
-void DevChannel::inputH264(const char* pcData, int iDataLen, uint32_t uiStamp , int prefixeSize) {
+void DevChannel::inputH264(const char* pcData, int iDataLen, uint32_t uiStamp) {
     if(uiStamp == 0){
         uiStamp = (uint32_t)_aTicker[0].elapsedTime();
     }
+
+    int prefixeSize;
+
+    if (memcmp("\x00\x00\x00\x01", pcData, 4) == 0) {
+        prefixeSize = 4;
+    } else if (memcmp("\x00\x00\x01", pcData, 3) == 0) {
+        prefixeSize = 3;
+    } else {
+        prefixeSize = 0;
+    }
+
     inputFrame(std::make_shared<H264FrameNoCopyAble>((char *)pcData,iDataLen,uiStamp,prefixeSize));
 }
 
diff --git a/src/Common/Device.h b/src/Common/Device.h
index 081d98d7..73832294 100644
--- a/src/Common/Device.h
+++ b/src/Common/Device.h
@@ -99,9 +99,8 @@ public:
 	 * @param pcData 264单帧数据指针
 	 * @param iDataLen 数据指针长度
 	 * @param uiStamp 时间戳，单位毫秒；等于0时内部会自动生成时间戳
-	 * @param prefixSize 264 其实头字节数，起始头可以是0x00 00 00 01 或 0x 00 00 01 或者没有起始头
 	 */
-	void inputH264(const char *pcData, int iDataLen, uint32_t uiStamp,int prefixSize = 4);
+	void inputH264(const char *pcData, int iDataLen, uint32_t uiStamp);
 
 	/**
 	 * 输入可能带adts头的aac帧