[Bug 703093] videomeasure: port to 1.0

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=703093

--- Comment #23 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
It looks like we wanted to make iqa a sink, and we didn't know what to do with
the src pad. I believe we need to find a solution to this ambiguity. It's
rather confusing. I think I'd prefer having a simpler element doing 2 -> 1 with
a message per metric, or a more complex one that does 1 + N -> N which covers
all the use cases.

Looking deeper, it might not be that complex to create an bin that aggregates
the messages, wrapping 2 -> 1 lower complexity elements. The change on IQA
would be minor and in fact would simply remove some corner cases that are not
really handled. That been would handle a tee to multiplex the reference
properly. 

Though, I must admit, I had a first impression was that such element should be
using GST_EVENT_SINK_MESSAGE, which is not possible if you aggregate, because
you'd get duplicates. I'm a bit ambivalent on this feature. What I care the
most is about providing new elements that does not have such ambiguity.

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