I have hundreds of music videos sourced from my UK TiVo in mpeg2 format.

These play back fine via XBMC and my XBOX on my TV and Nero Media Player on my PC but WinAmp displays them squashed up.

For various reasons I'd like to convert them to avi but I'm having problems with aspect ratios.

Typically the resolution of each video is 544x576 which I'm guessing is anamorphic? I'm assuming there is a flag which XBMC and Nero use to expand the image on playback but which WinAmp (and my video converters) all ignore.

I've tried lots of different conversion apps but always end up with a squashed (or unplayable) avi.

Can anyone tell me how to do the conversion and end up with an avi in the correct aspect ratio?