[Bug 740557] videotestsrc: add ball motion based on system clock

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740557
  GStreamer | gst-plugins-base | git

--- Comment #9 from carl at personnelware.com 2014-11-28 18:17:53 UTC ---

adding a property for "base on time or frame" - I think that just clutters the
docs/code with an option that may never get used; because I can't think of how
it would be used.  prolly cuz right now I don't need it ;)  

note: 99% of my use is live source and streaming over lan and wan, so that's
all I think about.  If someone tells me it would help debug a codec or
something, I'll be happy to add it when someone says "I need this."  Including
if you think it is needed so that no permutations of options are unavailable
which might be confusing to someone. 

Although scope creep alert:  If that's needed for that, then it is needed for
this too: 
  horizontal-speed    : Scroll image number of pixels per frame (positive is
scroll to the left)

Whoever wants this should write the docs and I'll implement it.  documenting
what I did so far was harder than writing the code.

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