Many people made the “long cable” joke; only one person did the maths.https://twitter.com/SimonKoppel/status/1016245526910693376 …
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My telly can control my Apple TV over the hdmi. So obviously the data flows both directions
A HDMI cable contains TMDS for video, and i2c for the low speed DDC stuff, a pin that is shared for CEC, HEC, and audio return, a ground pin, a +5V pin and a hotplug detect pin that's also used for HEC.
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TMDS is the only signal relevant for video. You'd just need to delay the TMDS signals. There is no return channel on TMDS. Your remote uses CEC.
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Thanks Clifford. That’s literally more than I knew about HDMI. Point still stands tho, whole cable - if so long, wouldn’t just impact the digital video signal :-)
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