[Bug 783501] New: Provide GstPreset for vaapi encoders.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783501

            Bug ID: 783501
           Summary: Provide GstPreset for vaapi encoders.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

There's GstPreset supported in gstreamer.
If we support this for vaapi encoders, I expect this can be involved to
gst-validate scenario for vaapi.(bug #773304)

Eg. If we have "Main" preset for main profile with dct8x8 disabled,

gst-launch-1.0 videotestsrc num-buffers=50 ! encodebin
profile="video/quicktime,varient=iso:video/x-h264+Main" ! filesink
location=test.mp4

and we can also include preset to gst-validate tools as the following:

gst-validate-transcoding-1.0 -o
"video/quicktime,variant=iso;:video/x-h264+Main" [input] [output]

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