> Thanks!! I explain better:
> My intention is develop a system for the university and i need MPEG
> compression,then Overo is perfect,right?

If you don't want to use a dedicated MPEG encoder chip (possibly
cheaper, pinouts might not match) nor do you have an FPGA with
good component libraries and you want the power of a DSP to
work with, I'd say yes, the Overo fits the bill.

> I want connect to camera port the video decoder TVP5146 and not a camera
> directly.Then i would know if i need to change the camera driver.
> The decoder and the camera have almost the same signals.

This TVP5146 is not something I'm familiar with; "almost" is an
interesting word. :) If you can make the decoder pin-compatible
(or nearly so) with the Caspa camera, I would say the Caspa driver
could be used as-is or modified slightly to work. I think the
camera connect to pins on the CPU that are fairly easy to work
with, so even a few pins being different would work. You already
have the decoder picked out and are apparently doing a bit of
board design, so the hardware part won't be too bad. Even
writing a simple I2C driver for the video data component isn't out
of reach.

Looks like you'll have a 20 bit incoming signal. I don't really know
what the Caspa provides, but it's not that different I don't think.
Best of luck!

> I know JTAG is another interface, but i thought i could program through
> JTAG too.

No worries; on Xilinx FPGAs and a lot of other embedded systems you can
actually transfer the binary to the chip over the JTAG debugging buss. It's just not an option
on Gumstix.