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</ul>
+<h3>VA-API state tracker environment variables</h3>
+<ul>
+<li>VAAPI_MPEG4_ENABLED - enable MPEG4 for VA-API, disabled by default.
+</ul>
+
+
<p>
Other Gallium drivers have their own environment variables. These may change
frequently so the source code should be consulted for details.