Pad an MPEG1 file without re-encoding?

[scottnic]

I've got some MPEG1 files that are encoded at 312x240 (I didn't encode them -- I'm not sure why that resolution was chosen...)

I want to put together a DVD compilation of them, but the DVD software doesn't like the resolution (not DVD standard).

Is there any software available (is it even possible...) that will allow me to add 20 pixels of black to the left and right of the frames (bringing it to a standard 352x240) without requiring a re-encode (with a resulting loss in quality)?

[scottnic]

Hmm... I just opened one of my video clips in Adobe Premiere Pro and it shows up there as 352x240. (I was getting the 312x240 from Windows Media Player's "Properties" dialog).

Now I'm not sure what these files are -- maybe they're vcd compliant? But if so, why won't my DVD software recognize them?

[scottnic]

Another update... Nero v6.0 recognizes the files as VCD-compliant, so I guess the problem is just that Adobe Encore DVD won't let me use VCD files to create a DVD.

From what I can determine, the DVD spec allows VCD-compliant MPEG1 video, so what DVD authoring programs will allow me to use them?