[Bug 793683] gstclockoverlay: Add ability to specify time to be displayed by GstClockOverlay

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793683

--- Comment #6 from Abhinav <abhitechiestar at gmail.com> ---
Hi Nicolas, 

Thanks for quick comment and guidance. 

> It's what I just said before, the users decides the when by placing the
> clockoverlay at specific place in it's pipeline. If you have a live capture,
> and want something close to the capture time, place it right next to your
> capture source.
> 
> > IMHO, most users would be interested in Wall Clock which corresponds to
> > buffer.
> 
> I'm not sure what you want exactly. 

Sorry for not being able to clearly articulate our requirement earlier. 
What we want is to display "wall clock" at the time of video capture (with sub
second precision), in the format as already supported by clokoverlay.

Even if we place clockoverlay just next to video capture source (e.g. v4l2src)
in our pipeline, we observed gap of few seconds as compared to wall clock time
of recorded video. There can be several reasons (e.g. buffer cached at source
and so on..), So placing clockoverlay just next to capture source is not enough
to achieve desired precision. 

Any suggestions for meeting above requirement is welcome.

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