[Bug 764316] vaapidecode: simplify downstream negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764316

--- Comment #19 from sreerenj <bsreerenj at gmail.com> ---
Okay, let me try to give one example where your patch is going to fail ;)

surface_resolution: 640x480
crop_rectangle: 320x240

everything is working fine...
now in the middle there is a surface resolution change:

new_surface_resolution: 1280x720
new_crop_rectangle: 320x240

here the crop_values are the same, but actual surface dimension get changed.
As per what i can see from the patch, the code will not try negotiate the pool
in gstvaapidecode even though it get negotiated inside libgstvaapi.

Am i missing something? :)

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