[rtmpdump] Resume???

[Michael]

It might be a stupid question with an obvious answer nevertheless:
 From http://rtmpdump.mplayerhq.hu/rtmpdump.1.html I learn "No resuming 
or seeking in live streams is possible"

 From the RTMPDUMP-application I learn learn that 'resuming is not 
possible with stdout'.

No resuming with live stream is obvious, but why is there no resuming 
with non-live streams which are not recorded (but watched on the fly via 
stdout)?

Thank's for clarification!
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