Has anyone tried pre-compression to improve image quality?

I am having a hard time creating a usable disk image in iDVD from my 1 hr 45 min FCE movie. Portions of the video are extremely pixelated, usually the grainier, lo-light clips.
Since I don't have Compressor or DVD Studio Pro to use to get more control over the compression, I considered trying to "pre-compress" my video by exporting the entire master sequence using Quicktime conversion to an Mpeg4 format and playing with the data rate so that it would be well under the 4 GB limit of a DVD5. Then I was going to re-import the Mpeg4 into a new FCE sequence, add chapter markers and export again as Quicktime movie into iDVD.
My reasoning is that iDVD will no longer have to compress the file and the pixelization won't be there if it isn't there in the Mpeg4. Has anyone tried anything like this to overcome iDVD's compression and get more control?
If you think I should post over at iDVD forum please let me know.
Thanks in advance,
Mike

What you want to do does not make sense. You are going to ADD more compression
iDVD will compress your video no matter what you do ... it has to, in order to create the MPEG2 that comprises a DVD. iDVD will always do this ... even if you could create your own MPEG2 (which you can't do if you don't have Compressor) it would still try to do that compression ... it is a consumer app designed for ease of use
The more you "step on" your video before it goes to to iDVD the worse it will be.
You are right; you need more control over your MPEG2 compression and you can't tinker with iDVD's compression engine like you could with Compressor
The symptons you describe are not unusual. I fin that anything over 90 minutes in iDVD can give you potential probs. The quality of the original video had to be really, really high ... and doing a double compression ain't gonna help that.
Is it feasible to split the project in half and make two DVDs? If the project is under an hour, you can use iDVD's Best Performance preference which tends to give you a better result.
Remember, iDVD doesn't really care about the "size" of your project, only its length, so tinkering around to reduce the file size won't help you.
It is unfortunate that Compressor is not a standalone program and that DVD Studio Pro is now only included as part of the Final Cut Suite. I suppose you could troll e-Bay to see if there are any older, independent versions of the program still kicking around

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