[Bug 782741] Improve element's metadata in regard to hw decoding

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782741

--- Comment #2 from Victor Toso <bugzilla at victortoso.com> ---
(In reply to Sebastian Dröge (slomo) from comment #1)
> Why are the ranks not enough for sorting here?

That would mean I need to know the plugins that do hw decoding in every
platform while I'm interested if I have any that can do h264/vp9 etc hw
decoding.

> And there's more to this than knowing if a encoder uses hardware. The
> hardware based on might still be slower in some use cases, its quality might
> be worse, it might only support different profiles than what you want to
> produce, etc.

IMHO it would be good enough to state that a given element uses hw decode. If
it can't decode a given profile or if the quality is worse, shouldn't matter
much.

The point is that in general we would like to try hw decode first. That's
probably covered by using playbin. But knowing if it is possible to hw decode
given video codec would help setup which codec should we use for streaming in
the host/guest machine.

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