Exact semantics of IVS Player getLiveLatency()?

Question

What exactly is getLiveLatency() measuring for a live stream?

https://aws.github.io/amazon-ivs-player-docs/1.7.0/web/interfaces/player.html#getlivelatency

Given:

content recorded (A) --> content received at AWS IVS ingest endpoint (B) ---> presumably some processing in AWS (C) ---> content available for a viewer to view on AWS IVS servers (D) ----> viewer downloads live data, a HLS segment (E) ---> viewer watches segment (F)

getLiveLatency gives the difference between which of the following?

1: A and E?
2: B and E?
3: D and E?
4: Other?

How is that number actually being computed?

Answer

Thank you for using the Amazon Interactive Video Service. The IVS Player's getLiveLatency method (https://aws.github.io/amazon-ivs-player-docs/1.7.0/web/interfaces/player.html#getlivelatency) measures the latency between when the content is received by Amazon IVS (B) and when the viewer watches the segment (F). The delay/latency before the content enters the IVS system is unknown to IVS, thus it cannot be calculated into the final live latency value.

Exact semantics of IVS Player getLiveLatency()?

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