bug fixed gb28181 capture

zhangmeng

2021-05-25 470d4180e2b86eee41c9c14910e4131d16edb8b7

 csrc/ffmpeg/property/VideoProp.cpp

@@ -17,6 +17,7 @@
   ,udp_port_x_(5000)
   ,udp_port_y_(65000)
    ,gpu_acc_(true)
   ,gpu_index_(-1)
    ,sample_aspect_ratio_(AVRational{0,1})
   {}