[Bug 784958] v4l2transform: implement stable element names

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784958

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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                 CC|                            |nicolas at ndufresne.ca

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
For this use case, I always had the impression that the kernel lacks
classification flags. As an example, v4l2transform simply does not work for
deinterlacer at the moment. It should work for color converter and/or scaler,
but might have strange results with blitters that can color convert (specially
if the input is not opaque). In this list, the blitter is really a thing that
exist (IMX6 and Exynos) but that we can't differentiate from the rest and where
fixes name can cause much more trouble then good.

I think we need some time to figure-out what to do in the long term. Meanwhile,
I'll give you patch a try, maybe we can find a way to enumerate all the
"converters" before assigning names, and run some heuristic to pick the best
videoconvert/videoscale replacement ?

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