Do any of the new DivX/Xvid/MPEG4 players allow you to adjust or select the playback aspect-ratio?

For instance, if you record something at 480x480 can you play it back in 4:3 aspect-ratio? (This is how SVCDs work, after all.)

What about backups of anamorphic DVDs, e.g. 720x480 image that's supposed to be played-back at 1.85:1 ? Worse yet, what about 720x360 images that are 2.35:1 ?!

Now, admittedly, you can do some of this in the TV . . . *IF* you have widescreen TV that allows you to adjust the image *AND* if the DVD isn't sending a wide-screen signal (that the TV already considers "Full" screen and won't adjust)