Hardware accelerated AVC decode not working

[zack4485]

Why is AVC decode using the software MFX decoder instead of my hardware GPU (Radeon RX580)?  I can see AVC is correctly using the NVIDIA GPU in my "sender" to encode the video stream, but the "receiver" is clearly doing software decode on the CPU.

Here are the relevant configuration entries:

## Reduce network bandwidth using the H264 Codec
Rgreceiver.ImageCodec.IsH264Enabled=1

## Offload H264 encoding to GPU: 0-CPU 1-GPU
Rgreceiver.ImageCodec.UseGPU=1

Here are the relevant log entries:

03-02-20 17:26:40 11600(11436) INFO - MFXDecoder::isSupported - Intel Media SDK will use SOFTWARE implementation.
03-02-20 17:26:40 11600(11436) DEBUG - ConsumerFactoryBase::createDecoder - Using MFXDecoder
03-02-20 17:26:40 11600(11436) INFO - MFXDecoder::isSupported - Intel Media SDK will use SOFTWARE implementation.
03-02-20 17:26:40 11600(11436) DEBUG - VideoRendererAdapter::State::registerObserver - DisplayModelAdapter
03-02-20 17:26:40 11600(11436) DEBUG - NizzaMediaConsumer::ctor
03-02-20 17:26:40 11600(11436) DEBUG - NizzaMediaConsumer::start
03-02-20 17:26:40 11600(8364) DEBUG - MFXDecoder::initialize - Trying to create the MFXDecoder in hardware
03-02-20 17:26:40 11600(8364) DEBUG - MFXDecoder::setupHardwareSession - Can't initialize the decoder in Hardware mode
03-02-20 17:26:40 11600(8364) DEBUG - MFXDecoder::initialize - Trying to create the MFXDecoder with partial hadware support
03-02-20 17:26:40 11600(8364) DEBUG - MFXDecoder::setupPartialHardwareSession - Can't initialize the decoder in partial hardware mode
03-02-20 17:26:40 11600(8364) DEBUG - MFXDecoder::initialize - Trying to create the MFXDecoder in software
03-02-20 17:26:40 11600(8364) INFO - MFXDecoder::initializeVideoDecoderSession - The video decoder is using the SOFTWARE implementation.(1)
03-02-20 17:26:40 11600(8364) INFO - MFXDecoder::initializeVideoDecoderSession - The video decoder is using version: 1.27