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To be really useful for the vidoesecurity applications plugin needs to implement pan (without decoding all the throuwn-away data), not just zoom as we discussed a year ago :-). At least with a step of one macroblock (16x16 pixels with no decimation), and even with JPED DC coefficients are not independent (difference in scan-line order is encoded).

Of course that will require getting inside the Mplayer to add the additionbal processing, but that is really needed for the multiple cameras applications.