Pixel Aspect Ratio - I thought I'd cracked this!

Can someone help me this?
I've imported a PAL widescreen video in to After Effects CS4 (the original editied file came from Premeire CS3) and I now want to render my video as an F4V file 'stretched' to a smaller size.
I reckoned half the size so I selected 512 x 288 (being 50% of the PAL size in square pixels - 1024 x 576).
However, the subsequent rendered F4V video comes out with black bars above and below, suggested that my dimensions are wrong (which I didn't think they were).
So I selected the After Effects preset for PAL wide screen in square pixels and it gives me 1050 x 768 which doesn't seem right to me!
However, if I select 50% of that (525 x 288), then the F4V is perfect with no black border.
My question therefore is why does After Effetcs work to its own set of rules for wide screen equivalents of set videos sizes?
Chummy

Read this!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Mylenium

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    Tom
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    http://www.mikeafford.com/blog/2009/03/pal-d1-dv-widescreen-square-pixel-settings-in-after -effects-cs4-vs-cs3/
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    Thank you.
    ATR

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    I searched but found no answer.
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    When I import this video into Encore 2.0 It comes out as full screen. Not only is it full screen, but when I preview the dvd, the video is blurry with scan lines and black bars on the left and right side. The menu however, is widescreen (I used a template as a test)and perfectly clear. I tried to select the asset and go to file>interpret footage, but this option is grayed out. I have also tried exporting an avi from after effects and importing that into Encore. It still will not let me set the pixel aspect ratio. I have read that After Effects does not embed the pixel aspect into exported videos. I have also read that I should export mpeg2 videos for use in Encore, however I do not see this option in After effects or Premiere Pro.
    What am I doing wrong? Any help is appreciated. If I left any information out that could be useful, please let me know.

    (Ack, for some reason I typed "DVI" and really meant "DV")
    Thanks for the response. I don't really care if I preserve the 4:3 aspect ratio. Or does my GL1 not use square pixels and I just never noticed it? It's strange I've never seen this problem until FCE HD.
    I have tried exporting a number of ways from FCE, including Export > QuickTime Movie... and Using QuickTime Conversion... For the latter, I typically set it to export as 720x480. I always export as video. The final export contains video clips as well as still images within the video.
    I am a bit embarrassed having to ask this question. I've been working with still images in photoshop for over a decade and worked a lot with video during that time as well.
    Thanks again.

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