这里是sdpOffer:offerv=0o=-15143669521417411INIP4hostxs=Mountpoint99t=00a=group:BUNDLEvideoa=msid-semantic:WMSjanusm=video9UDP/TLS/RTP/SAVPF96c=INIP4hostxa=sendonlya=mid:videoa=rtcp-muxa=ice-ufrag:7joHa=ice-pwd:bdRP/kVha/3vSoGEvstOxKa=ice-options:tricklea=fingerprint:sha-256D2:B9:31:8F:DF:24:D8:0E:E