how to make decodebin select va-api decoder.

[cfd new]

gst-launch-1.0 -v filesrc location=/home/simulator/Downloads/test.mkv ! decodebin ! autovideosink
has output to show av decoder is applied. How to make decodebin select va-api decoder. 
vaapi decoder is not installed. Instead, va-api decoder is installed.

   Joe 

 
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