[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 #4 from Abhinav <abhitechiestar at gmail.com> ---
Well - thanks for explaining the intent and difference between clockoverlay and
timeoverlay. While, what you explained makes sense - as A novice it was hard
for me(and probably others) to get this interpretation correct by looking at
plugin names "timeoverlay" vs "clockoverlay".

Anyways, we used clockoverlay and found that it is not same as "Wall Clock"
value of stream which is being recorded and there is a difference (more than
few seconds) in our pipeline. We realized that it is because clockoverlay uses
"current time" and has no direct relation with "Wall Clock" of stream capture
time. 

I am not sure, whats the use of such wall clock for end users, if this wall
clock doesn't have any predictable relation with stream time. Then we realized
that there is a need for user to specify "What time he wants to display in wall
clock format" ? Is it the wall clock time of buffer arrival at clockoverlay ?
Is it the wall clock time of recording ? or any other. IMHO, most users would
be interested in Wall Clock which corresponds to buffer.

IMHO, clockoverlay needs a property for users to be able to specify which "Wall
Clock" time they are interested in ? For many users, if wall clock has no
relation with buffer, it may not be useful enough.

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