I have a Smash Bros Melee setup with a low-latency display and a low-latency Wii->HDMI converter. I'd like to split the signal across two displays (so everyone can see the screen during 4-player matches), ideally with zero added latency (but up to 2ms or so of extra latency would be OK).
With analog video tech you can just physically split the signal, but I'm not sure this applies to HDMI; most splitters are active devices. Do these splitters introduce any lag (e.g. by capturing, buffering, and retransmitting packets)?
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I can't say definitively for all HDMI splitters because they can be implemented in different ways, but the ones that I have used all produce no input lag, even though they require A/C power.
The bigger concern for you would actually be the composite -> HDMI upconverter, because the processing that needs to be done for that could potentially produce lag. You say that it is low-latency though, so you should be good.
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