string(291) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%91%84%E5%83%8F%E5%A4%B4%E5%AE%9A%E7%A0%81%E7%8E%87%E5%92%8C%E5%8F%98%E7%A0%81%E7%8E%87%E5%93%AA%E4%B8%AA%E5%A5%BD%E4%BA%9B => Failed to connect to 14.18.46.51 port 38206: Connection refused"
摄像头定码率和变码率哪个好些
