Merge pull request #7975 from jellyfin/libva-driver-env

(cherry picked from commit 910df89ccefd3f9ddef4a189715f90dcb4191e7f)
Signed-off-by: Joshua Boniface <joshua@boniface.me>

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -716,6 +716,9 @@ namespace MediaBrowser.Controller.MediaEncoding
                 }
                 else if (_mediaEncoder.IsVaapiDeviceInteli965)
                 {
+                    // Only override i965 since it has lower priority than iHD in libva lookup.
+                    Environment.SetEnvironmentVariable("LIBVA_DRIVER_NAME", "i965");
+                    Environment.SetEnvironmentVariable("LIBVA_DRIVER_NAME_JELLYFIN", "i965");
                     args.Append(GetVaapiDeviceArgs(null, "i965", null, VaapiAlias));
                 }
                 else