Autosizing Question

[re201]

I have been converting .avi files to DVD 16:9 using ffmpegX and when I play the dvd on my widescreen TV they are TOO BIG. Some of the movie gets cut off.

Which Autosizing ratio should I select if I want to convert to widescreen: (horizontal black bars above and below)?

Here's an example of an original AVI file size; msmpeg4, yuv420p, 640x272
When I select DVD 16:9 the ratio jumps to 720x480.
Can I just manully change the 'video size' parameters back to the 640x272 without screwing up the aspect ratio visually?

Thanks

[Case]

I have been converting .avi files to DVD 16:9 using ffmpegX and when I play the dvd on my widescreen TV they are TOO BIG. Some of the movie gets cut off.

What gets cut off? How much gets cut off? Where is it cut off? Unless you crop, nothing should get cut off. Except the default tv overscan maybe.

Which Autosizing ratio should I select if I want to convert to widescreen: (horizontal black bars above and below)?

If the aspect ratio is 2.35:1 (as indicated by 640x272), then you should letterbox, but leave the video size at 720x480. Easiest is to use the auto letterbox that comes with QuickTime decoding, if QT works with your msmpeg4 AVI.