I met the same problem too. Posted it and got Petter's answer. His reply is very helpful.
BTW, You have to give more information about how do you use SyncOperate at your encoder side. The most possible reason is how fast to clean encoded buffer in CEncTaskPool. If you are using RTP streaming, you have check your network speed.
Hi, Thanks for jiuxiang and Petter's response. How can I know ifI set low latency success or not? Do you have any data about how much latency this library require in low latency and non-low latency mode.