preserving quality of video when burning to DVD

Hey,
I'm burning a DVD in DVDSP but the quality of the video keeps getting degraded once burned to DVD.

The original file is 1024 x 576, Apple ProRes 422 (HQ) codec and 1.49 GB. It looks really good when played on my computer but once burned to a DVD the quality gets much worse, like the data rate is being heavily limited.

I'm wondering what kind of compression takes place when burning to DVD through DVDSP and if there's a way to work around it? Or at least try to preserve the quality of the original file?

Any insight would be helpful, I'm still learning about encoding and compressing video files so I'm sorry if this isn't as detailed as it could be. Let me know if any more information is needed in order to help me out.

Thanks!