[AVTCORE] RFC 8888 clarification: What does "active" mean?

[Harald Alvestrand <[e-mail]>]

In looking at RFC 8888, we found an interpretation problem:

"RTCP Congestion Control Feedback Packets SHOULD include a report block 
for every active SSRC."

Two easily inferrable interpretations for "active":

- Packets have been seen, and no BYE or timeout has occured
- Packets have been seen since the last report was sent

Now, the size of the reporting packet is very sensitive to this 
interpretation - back-of-the-envelope says that packets according to the 
last interpretation can be 1/3 of the packets according to the first.

So - which interpretation is intended here, and why?

Harald