Probably best to do it while you capture - ie from tape in HDV camera to ProRes as you capture. There are HDMI capture cards that are cheap (Blackmagic) - or there are firewire ways to do it... here is a tutorial
http://library.creativecow.net/articles/poisson_chris/hdv-prores.php
Its easier (on the computer / render - harder on drive space - but drive are cheap) to edit ProRes than HDV.
Thanks,
Harry
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