Backport pull request #8061 from jellyfin/release-10.8.z

Fix intel dx11-ocl interop taking too long to initialize on windows

Authored-by: nyanmisaka <nst799610810@gmail.com>

Merged-by: Claus Vium <cvium@users.noreply.github.com>

Original-merge: 9854751137

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -4506,7 +4506,9 @@ namespace MediaBrowser.Controller.MediaEncoding
 
                     if (isD3d11Supported && isCodecAvailable)
                     {
-                        return " -hwaccel d3d11va" + (outputHwSurface ? " -hwaccel_output_format d3d11" : string.Empty) + (isAv1 ? " -c:v av1" : string.Empty);
+                        // set -threads 3 to intel d3d11va decoder explicitly. Lower threads may result in dead lock.
+                        // on newer devices such as Xe, the larger the init_pool_size, the longer the initialization time for opencl to derive from d3d11.
+                        return " -hwaccel d3d11va" + (outputHwSurface ? " -hwaccel_output_format d3d11" : string.Empty) + " -threads 3" + (isAv1 ? " -c:v av1" : string.Empty);
                     }
                 }
                 else