just experiment, on a 1-minute piece or so. Some codecs make great results on great compression, others are lousy while hardly compressing at all. I'm not that good on video to know by heart. And there are shiploads of free video-format-converters on the net.

RealConverter (with Realplayer), Divx Converter, Windows Movie Maker, Pinnacle VideoSpin, ... all can do things for you. Plus everything in the OpenSource area.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though