On Sun, 2 May 2021, Bouke wrote:

From the manual:
'timestamp_align
Capture start time alignment in seconds. If set to nonzero, input frames are 
dropped till the system timestamp aligns with configured value

Ok, when I put -timestamp_align in my command, it  does wait ‘a bit’ before 
starting capture.
That’s what I’m after, but i have no clue how long it waits. It’s not a ‘wait X 
seconds’ for sure.

It waits until UTC modulo timestamp_align becomes 0. So for 60 it waits until a full minute boundary is reached.

Regards,
Marton
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