"Uncrashable" video/audio source and sinks

[superlou]

>> Looking through the code, I didn't see anywhere for it to generate "blank"
frames...

So, I found it in gstintersurface.  Inter* just creates/looks for surfaces
with a unique name, and returns a blank one (happens to be black) if
nothing's there.  Using videotestsrcs, a test pipeline for connecting,
disconnecting, and reconnecting worked great.  My only concern is what
happens if I mix a live source like videotestsrc or v4l2src and a non-live
source like uridecodebin?  Is there a way to make them all look live without
having trouble on the playback framerate for the playbin (something I ran
into a while back when using videomixer2 with v4l2src and uridecodebin)?



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