remoteJoined2PacketReceived property

If the local user calls startMediaRenderingTracing before the remote user joins the channel, this value is the time interval (ms) from when the remote user joins the channel to when the local user receives the remote video stream. If the local user calls startMediaRenderingTracing after the remote user joins the channel, this value is the time interval (ms) from startMediaRenderingTracing to receiving the remote video stream. If the local user calls startMediaRenderingTracing after receiving the remote video stream, the value is 0 and has no effect. In order to reduce the time of rendering the first frame for remote users, Agora recommends that the remote user publishes video streams immediately after joining the channel, and the local user immediately subscribes to remote video streams to reduce this value.