Try h264 on intel and AMD hardware using VA-API, using vapostproc
to do the color conversion using specialized hardware. We're not adding
a vaapi pipeline using the color conversion GL shader here, as vapostproc
color conversion should be better suited for anything needed by vaapi
based encoders/decoders.
A capsfilter is used to enforce the use of DMAbuf (memory:DMABuf) with
the new explicit modifier API (format=DMA_DRM).
Also, we're using the new va* gst elements instead of the vaapi* ones
here, as the vaapi* elements are deprecated, while the va* elements are
actively maintained.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2080>
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