make sure gpu encoding can be disabled

do not set d3d manager on mf sink writer so it does not start
using gpu encoder even when hw transforms are set to false

wcap_encoder.h

@@ -248,11 +248,6 @@ BOOL Encoder_Start(Encoder* Encoder, ID3D11Device* Device, LPWSTR FileName, cons
 	HR(ID3D11DeviceContext_QueryInterface(Context, &IID_ID3D11Multithread, &Multithread));
 	ID3D11Multithread_SetMultithreadProtected(Multithread, TRUE);
 
-	UINT Token;
-	IMFDXGIDeviceManager* Manager;
-	HR(MFCreateDXGIDeviceManager(&Token, &Manager));
-	HR(IMFDXGIDeviceManager_ResetDevice(Manager, (IUnknown*)Device, Token));
-
 	DWORD InputWidth = Config->Width;
 	DWORD InputHeight = Config->Height;
 	DWORD OutputWidth = Config->Config->VideoMaxWidth;
@@ -375,8 +370,18 @@ BOOL Encoder_Start(Encoder* Encoder, ID3D11Device* Device, LPWSTR FileName, cons
 	{
 		IMFAttributes* Attributes;
 		HR(MFCreateAttributes(&Attributes, 4));
-		HR(IMFAttributes_SetUINT32(Attributes, &MF_READWRITE_ENABLE_HARDWARE_TRANSFORMS, Config->Config->HardwareEncoder));
-		HR(IMFAttributes_SetUnknown(Attributes, &MF_SINK_WRITER_D3D_MANAGER, (IUnknown*)Manager));
+		if (Config->Config->HardwareEncoder)
+		{
+			HR(IMFAttributes_SetUINT32(Attributes, &MF_READWRITE_ENABLE_HARDWARE_TRANSFORMS, TRUE));
+
+			UINT Token;
+			IMFDXGIDeviceManager* Manager;
+			HR(MFCreateDXGIDeviceManager(&Token, &Manager));
+			HR(IMFDXGIDeviceManager_ResetDevice(Manager, (IUnknown*)Device, Token));
+			HR(IMFAttributes_SetUnknown(Attributes, &MF_SINK_WRITER_D3D_MANAGER, (IUnknown*)Manager));
+
+			IMFDXGIDeviceManager_Release(Manager);
+		}
 		HR(IMFAttributes_SetUINT32(Attributes, &MF_SINK_WRITER_DISABLE_THROTTLING, TRUE));
 		HR(IMFAttributes_SetGUID(Attributes, &MF_TRANSCODE_CONTAINERTYPE, Container));
 
@@ -662,7 +667,6 @@ BOOL Encoder_Start(Encoder* Encoder, ID3D11Device* Device, LPWSTR FileName, cons
 
 	ID3D11Multithread_Release(Multithread);
 	ID3D11DeviceContext_Release(Context);
-	IMFDXGIDeviceManager_Release(Manager);
 
 	return Result;
 }