Multi-clipping with different frame sizes

I have two video clips that I would like to merge into a multiclip. Unfortunately, they have two different formats. One is an Apple ProRes 422 (1024x768), while the other one is a PAL 720x576.
As far as I know, there's no way of making a multiclip out of the two, so I'm trying to compress the ProRes into a PAL 720x576, but the result is just awful. Considering the ProRes 422 is a screen capture, any suggestion on how to obtain a high quality multiclip out of the two original tracks?
I'm using Compressor and Final Cut Pro 7.

Let's do the math…
Your ProRes contains a bit less than 800,000 pixels per frame while your PAL is only about 400,000; one of every two of your original pixels is being thrown away or smooshed into the PAL format so, yes, I imagine it looks pretty bad. You can, of course, scale up the PAL but then you are merely doubling the size of every pixel, you are ot adding any new detail or resolution.
Decisions like this are  made by carefully assessing the output requirements, not the editing setup. How will you display the final piece? If you have HD playback resources and needs, you must scale the PAL up If you are going to standard def of DVD, then both of your sources are going to get smooshed into obscurity.
If you have the ability to maintain the highest rez, you can bring your 768 footage into a 576 sequence and, without scaling it so the video is cropped, move it around in sync with your soundtrack so the important part of the screen capture is visible. Export at 576. You will also need a full screen version to handle cutaways.
However, just my opinion, using multiclip for  two inputs is way overkill. Easier to just edit conventionally with two tracks and a razor blade.
bogiesan

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