Compression artifacts on long form video

I have created three 1:45 min. videos on iMovie (multi-cam event shot on professional DVCAM camcorders (Sony DSR-390). When I burned to i-DVD5.1, I was disappointed with the image quality. The movies look great but there are very noticeable compression artifacts against dark backgrounds (the black area "swim" with pixel blocks) on the DVD At first, iDVD required me to use a dual-layer disc which I did and then was able on a second (seperate encode) try to use a standard single layer. The first pass, I used "best performance" preference. The second, I used "best quality." Both deliver slightly different but similarly disappointing results.
One question is: does iDVD 5.1 automatically compress in proportion to the file size/running length? The other is: is there any other tricks that can reduce the compression artifacts without having to go into more professional solutions (Compressor/DVDPro).
I have succesfully burned other long form programs but not quite this long. The most notable quality issues in previous projects were moving pixels blocks showed up on fades ins.
Any thoughts will be greatly appreciated.
Powerbook G4 167MHZ   Mac OS X (10.4.5)  

Hi DP,
welcome to this forum
iDVD is a consumer tool, so convenience is No1, and the main user gruop is the average "Daddy films son in the zoo" moviemaker... as me!
the specs allow up to 120min, but that pushes as said before iDVD to its limits: iDVD uses a "simple" audio codec (=huge files) and a very high bitrate with projects below 60min (8kB/Sec), that drops (dramatically) when doing longer projects.
switching "performance/quality" is to be translated with VBR/CBR...
you have two (and a half) options:
create two disks
spend $$$$ for DVDSP
all free otpions I do know (ffmpeg) don't allow setting manually bitrates for specific scenes...
silly workaround:
you could add some slight "blurr" on that specific, low key/dark scene, that reduces artifacts too... but ... well, blurrs the scene ..

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