Require FL 11.0 for the D3D11VA renderer

We would probably be okay with 10.0 (SM4), but let's not risk
encountering GPU driver bugs like we do on old AMD cards.

app/streaming/video/ffmpeg-renderers/d3d11va.cpp

@@ -162,6 +162,7 @@ D3D11VARenderer::~D3D11VARenderer()
 
 bool D3D11VARenderer::createDeviceByAdapterIndex(int adapterIndex, bool* adapterNotFound)
 {
+    const D3D_FEATURE_LEVEL supportedFeatureLevels[] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_11_1 };
     bool success = false;
     IDXGIAdapter1* adapter = nullptr;
     DXGI_ADAPTER_DESC1 adapterDesc;
@@ -211,8 +212,8 @@ bool D3D11VARenderer::createDeviceByAdapterIndex(int adapterIndex, bool* adapter
                                | D3D11_CREATE_DEVICE_DEBUG
                        #endif
                            ,
-                           nullptr,
-                           0,
+                           supportedFeatureLevels,
+                           ARRAYSIZE(supportedFeatureLevels),
                            D3D11_SDK_VERSION,
                            &m_Device,
                            &featureLevel,