编码H264时支持时间戳透传，修复时间戳相关问题

src/Codec/H264Encoder.cpp

@@ -321,6 +321,8 @@ int H264Encoder::inputData(char *yuv[3], int linesize[3], int64_t cts, H264Frame
         _aFrames[i].iType = pNal.i_type;
         _aFrames[i].iLength = pNal.i_payload;
         _aFrames[i].pucData = pNal.p_payload;
+        _aFrames[i].dts = _pPicOut->i_dts;
+        _aFrames[i].pts = _pPicOut->i_pts;
     }
     *out_frame = _aFrames;
     return iNal;

src/Codec/H264Encoder.h

@@ -27,6 +27,9 @@ public:
         int iType;
         int iLength;
         uint8_t *pucData;
+
+        int64_t dts;
+        int64_t pts;
     } H264Frame;
 
     H264Encoder();