Encoded video is full of artifacts, regardless of codec. Help?

I'm trying to make a video out of some of my simulation results. I've made a bunch of these before with good results, but the most recent one is making me crazy. The individual rendered frames look like this:

http://scorpio.physics.brandeis.edu/ars/as-montage-00001.png

However, the frames in the encoded movie are full of crap - off-color bands and regions:

http://scorpio.physics.brandeis.edu/ars/Screenshot-1.png

The weird part is that it doesn't matter what codec.I use. I'm using mencoder, and I've tried:

-ovc x264 -x264encopts tune=animation (which I've had good results with in the past)-ovc lavc -lavcopts vcodec=mpeg4-ovc lavc -lavcopts vcodec=ffv1 (supposedly lossless)
I also tried encoding with avconv, with the same results. The resulting movies all look terrible, and they all look terrible in the same way.

Any ideas?

Probable answsers

Thanks for the help Mathgirl32. I wasnt sure on what it all supported.

don't be haten... i looked on google nottin

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