> On the other hand, I did mentally tinker with the idea of just stopping t=
he clock on an R-Pi and
>  shutting down most peripherals.=20

I wouldn't worry, a small SLA should allow it to run continuously.

> On power up.a small PIC or other uC could re-power-up all peripherals on =
the Pi and re-start the
> clock to the R-Pi and it *should* be none the wiser.  But I still want to=
 learn about video, so not
> pursuing this option currently.

The problem there is that you are letting yourself in for dealing with high=
 speed signals that have their own hassles. Depends how much time you want =
to spend on it to get everything running how you want.

Note that devices like the R-Pi don't have the processor deal with the vide=
o, that is done separately in a high speed chip, then dumped to the process=
or through DMA or dual port memory.

If you do wish to pursue this route I suggest starting with a R-Pi camera a=
nd using an FPGA to interface to it.



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