Still have flicker after Denoising with AviSynth

[VideoFanatic]

I seem to have a problem where after denoising I still have flicker. Some videos which are high quality don't have this problem, it just seems to happen with videos which are lower quality. Here's the script I use:

The first line deblocks and denoises. The other lines get rid of the remaining noise.

Mpeg2Source("I:\New\z = Encode\RAW July 21 1997 Edited.track_224.d2v", CPU=6)
DeGrainMedian(limitY=2, limitUV=3, mode=1, interlaced=true)
DeGrainMedian(limitY=2, limitUV=3, mode=1, interlaced=true)

Here's a sample

Here's an ISO

Could someone please suggest a script that would get rid of this flicker. Thanks