[Bug 712782] Require a feature to display buffered status when using push source

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=712782
  GStreamer | gst-plugins-good | unspecified

--- Comment #4 from Justin Joy <justin.joy.9to5 at gmail.com> 2013-11-21 13:03:52 UTC ---
When I saw Olivier's comment, I was little confused. But my view is slightly
different from QUERY_BUFFERING's.

If I am wrong, please correct me.

As I know,  Queue2  element can make response about QUERY_BUFFERING, and it set
 data based on itself internal data. 

However, if source element handles or has a kind of buffer inside, this data
from Q2 is not fit for displaying buffer status because Q2's data would be in
the middle of actual buffered size.
In this reason, I think the read position from source element will be more
accurate. In fact, when I implemented the buffered status based on this
position property, it was acceptable and I could see the progress bar like
youtube's.

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