RSTP Stream audio not available to Pixel Stream

Development Audio
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Re. UE-78273 the latest update to VlcMedia plugin appears to have resolved rtsp video streaming into UE4. I am able to stream this into UE4 via VlcMedia and then out as a Pixel Stream. However the audio is not available to Pixel Stream (audio plays in UE4 fine).

[2021.06.28-10.29.25:485][  0]PixelStreamingWebRTC: Error: (adm_helpers.cc:47): Unable to access speaker.
[2021.06.28-10.29.25:486][  0]PixelStreamingWebRTC: Error: (adm_helpers.cc:53): Failed to query stereo playout.
[2021.06.28-10.29.25:486][  0]PixelStreamingWebRTC: Error: (adm_helpers.cc:56): Failed to set stereo playout mode.

Using

Any workarounds to get rtsp streaming audio inbound to UE4 available to pixel stream outbound?