At work I use an HDV camera, 1.33 pixel aspect ratio. To make the flash files I export uncompressed 1440x1080 1.33 and give it to the web guy. He uses Flash Video Encoder and resizes to 533x300 and it comes out looking great see example here
Now I filmed something widescreen DV 1.2 PAR. I am trying to follow the same workflow, exported 720x480 1.2 PAR uncompressed, and now am taking it into the Flash Encoder, but am not sure what dimensions would correct the wideness of 1.2, rather than 1.33 . It won`t let me change to square pixels, so I need to manually change the cropping dimensions, is there a formula or knows size to use for this?