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vaapidecode,vaapipostproc: Disable DMAbuf from caps negotiation.

Víctor Manuel Jáquez Leal requested to merge vjaquez/gstreamer:vaapi-disable-dmabuf into 1.20

Given the amount of complains about artifacts when negotiating dmabuf given incompatible drm-formats, and that there's no enough bandwidth for a proper and quick fix in gstreamer-vaapi, this patch disables, from decoders and postprocessor, the DMABuf caps feature.

For those who needs DMABuf can use the va elements in -bad, increasing their ranking for autoplugging by using the environment variable GST_PLUGIN_FEATURE_RANK=vah264dec:MAX, for example.

This can be considered a first step to the deprecation of gstreamer-vaapi in favor of the va plugin in -bad.

Fixes: #1137 (closed)

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