I'd look for a USB camera sensor with mpeg built-in, so that the host
CPU would only need;

- a USB controller and stack,

- an SD controller and stack,

- a filesystem stack,

- probing for the USB device and asking for the stream,

- reframing the stream into whatever format is desired.

An RTOS of some sort would be handy.

A complete OS just makes it too easy, no challenge.

For quick hackable prototypes, perhaps BeagleBone or a Raspberry Pi
Zero with camera.  The latter would take me about half an hour to
configure for the application described in this thread; camera to
microSD card.

--=20
James Cameron
http://quozl.netrek.org/
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