修正rtmp时间戳异常的bug

src/Rtmp/Rtmp.h

@@ -93,6 +93,7 @@ public:
     uint8_t typeId;
     uint32_t bodySize = 0;
     uint32_t timeStamp = 0;
+    bool hasAbsStamp = false;
     uint32_t deltaStamp = 0;
     uint32_t streamId;
     uint32_t chunkId;