[Bug 759860] glfilters: Attach composition overlay when not supported

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759860

--- Comment #5 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Matthew Waters (ystreet00) from comment #4)
> And what's the difference with this bug?

One is a feature request, which is to add ability to compose in GL the overlay
at any point in the pipeline. I believe the right way is our first idea, which
is to create an element that only apply the composition and output a new
texture. I believe this element does not have to be a new one, glvideomixer
seems to be a good fit (it's at least very similar task).

But for this bug, I'd simply fix it, so something like:

  upload ! .. ! download ! overlay ! glimagesink

Should render the text in software and not attach wrongly the composition likes
it does now. I do remember having tested this, so this is likely a regression,
but I would not bet on that.

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