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Microsoft Video 1. The worst codec in the history of history. Especially consider the gradient provided by YouTube's interface.
Cinepak's codec by radius. The biggest thing is the fuzziness. Thus degrading the quality.
Intel's IYUV codec. It could be better, but not as bad of the previous two.
CamStudio's lossless codec is better than using CamStudio itself. It's really surprising.
TechSmith is like using no codec at all, but it compresses the file really well. For some reason it does not show great quality in this video.
Using no codec gives outstanding quality (unless you're using CamStudio.) But the file size is gigantic. (400 MB vs. TechSmith Codec's 31 MB.)