[mythtv-users] HDMI-CEC ?
linux at thehobsons.co.uk
Tue Oct 11 18:20:55 UTC 2011
>While, CEC to me is a good concept, it seems to require an HDMI chain.
That's rather inplicit in the whole idea !
>(Although CEC commands may also be routable over Ethernet?)
>An IP solution seems a better way to go as it is even more widespread
Actually I disagree. IP is VERY new in this context and HDMI is far
more ubiquitous. The other thing is that HDMI by definition connects
the devices you want to control, and almost certainly does not
connect devices you don't want to (eg other disk players, tvs, etc in
As to nVidia and support for CEC, looking on Wikipedia I see that CEC
is carried on it's own pin. Thus it doesn't need support from the
video chip at all, it just needs that pin either bringing out to a
header for something external to be connected, or it needs connecting
to a suitable (and separate) comms chip to send/receive messages.
Of course, the video chip manufacturer could include this in the
video chip - but it's not mandatory.
CEC being on a separate pin is quite convenient for the manufacturers
of the unit that started this thread - it means they don't have to
have any circuitry to deal with the high speed video signals, and can
just link teh pins across from one HDMI connector to the other.
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