I've just started to get my head around pixel aspect ratios, and I have a question. (I'm editing in PAL).
If I have edited a 720 x 576 video with a pixel aspect ratio of 1.422 (16:9) and export it to a DVD. It will playback at a 16:9 aspect ratio on TV and PC/Mac.
However, if I just export the video to desktop, the video will squash back to 4:3, unless I export with an encoder/use square pixels. So I'm wondering. Is it required to export with square pixels when exporting to desktop?