--- a/dom/media/platforms/wmf/DXVA2Manager.cpp
+++ b/dom/media/platforms/wmf/DXVA2Manager.cpp
@@ -1087,17 +1087,17 @@ D3D11DXVA2Manager::ConfigureForSize(uint
 
   RefPtr<IMFMediaType> outputType;
   hr = wmf::MFCreateMediaType(getter_AddRefs(outputType));
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
   hr = outputType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Video);
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
-  hr = outputType->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_NV12);
+  hr = outputType->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_ARGB32);
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
   gfx::IntSize size(mWidth, mHeight);
   hr = mTransform->SetMediaTypes(inputType, outputType, ConfigureOutput, &size);
   NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
 
   return S_OK;
 }