SRT does not respond to events on time scales shorter than 20 ms.
The receiver buffer will not let the upstream application read a packet until ACK is sent. ACK is sent every 10 ms (LiteACK can be sent in between at higher data rates), and all packets are stuck in the receiver buffer until they are acknowledged by the receiver.
It limits the minimum end-to-end latency of SRT to ~20 ms.
Also the minimum interval of Periodic NAKs is 20 ms.
See also: How to Configure SRT Settings.
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