use your TV to de-embed. Run HDMI into it, and then use the optical digital output to your benchmark
The only problem with that is A/V sync; at least for me, it was out of sync. I can't remember, however, which was delayed; audio or video
Thank you all for your suggestions. The reason why I don't want to connect my Apple TV directly to Marantz is so I can pass the sound to the Benchmark DAC to reduce some of the jitter which plagues Apple TV. One solution would be to use the OPPO HDMI IN as a de-embedder an use the optical out to route to the DAC. In this case no need for an external de-embedder.
I understand that Apple TV has limits to sampling and I should look at a better source (or maybe build one using Mac Mini) - but I really don't need a music server as I am driving all my ripped CD's on FLAC through the OPPO via a HD.
A decent streamer with excellent sound is all that I need at this time. Open to moving to TIDAL or Spotify (slightly better than Apple).