I'm sure there are a lot of people who process analog captures and would like to have a good and fast chroma denoiser. CNR2 v2.4 doesn't work with CCE and v2.51 is just broken, the value for scdthr has to be insanely high for the filter to do anything and then the filter misses all the scenechanges.
Here's the latest version (v2.51), which doesn't crash in CCE but due to the scdthr issue is unusable at the moment.
http://cultact-server.novi.dk/kpo/avisynth/cnr2_51.zip
Could someone please take a look at the filter?