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Tracking down the missing codecs (x264 etc)
I've been looking around these forums and the internet in general for information about lossless and other codecs, and why some are not available in the latest Camstudio version.
I did a bit of my own experimentation and found they go missing between r264 and r273. The reason they go missing is due to colorspaces. Codecs that are not operating in RGB color space do not appear in r273 and later versions. This is what makes codecs like x264 disappear from the list, since it operates in YV12 colorspace.
I've also noticed that this can make RGB-capable codecs disappear as well. For instance, using the Lagarith Lossless Codec, you can configure it to use RGB, YUY2, or YV12 colorspace. If you don't choose RGB, capture will fail to start, and the codec will disappear from the list. To get it back, you'd have to configure it to use RGB from another program such as VirtualDub.