Converting between multiple formats should be as easy as possible in my book and Power Video Converter goes a long way to ticking all the right boxes.
Power Video Converter is designed to meet all your needs when converting files between AVI, MPEG1, MPEG2, VCD, SVCD, DVD, WMV, ASF, DAT and VOB formats. The big advantage of Power Video Converter is its speed - it's lightning quick and 5 minute clips can be converted in little more than a minute.
Power Video Converter supports batch conversions and it also joins split video files into one. This means you can divide a large clip into several pieces, convert it and then rejoin it together, which is useful. In addition, you can extract audio from mp3, wav and wma files and even extract images from clips to BMP format.
It's a little pricey to upgrade but Power Video Converter allows you to do just about any conversion in super quick time.