TV-repeater with macro

[einar]

I would like to build a repeater:

If I send a "OFF" signal from my TV-ir-remote,
the repeater should also send a "OFF" signal to the TV-ir-remote-sensor, no sweat,

but:

if I send ANY other signal than "OFF", the repeater should send a macro to the TV-ir-remote-sensor.
The macro should start the auto-off function in the tv, for instance turn off the tv after 1 hour.

Can you help ?
thanks einar