[Bug 758344] avviddec: May set padded width/height in pool caps

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758344

--- Comment #23 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 316545
  --> https://bugzilla.gnome.org/attachment.cgi?id=316545&action=edit
avviddec: Make sure to use a buffer pool with the correct width/height
configured on it for pushing buffers downstream

If downstream does not provide a (usable) pool, we would use our internal
pool. But the internal pool might be configured with a different width/height
because of padding, which then will cause problems if we push buffers from it
directly downstream.
Instead create a new pool if the width/height is different.

This prevents crashes with vaapisink and d3dvideosink for example.

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