I don't have any screen shots at the moment (I'm not at my desk), but while encoding something last night with zarxgui I noticed one scene in my video that had pretty severe and ugly banding issues at crf 20 and even crf 10. The footage itself, after closer inspecting, did have some banding in it both in Premiere and after export (so nothing screwed up in that step) but it was far more subtle, and I practically had to stand above my monitor to notice it at a bad viewing angle. I tried adding gradfunkmirror(x) {x=1,2,3} to the avs created for the import into zarxgui and brought the crf all the way down to 5 but only noticed a slight improvement. Interestingly, the banding was not visible to me in vdub with the gradfunkmirror(3) avs script, but was still there in the encoded version. What other options do I have to get rid of this banding? Are there other flags that might be able to deal with this issue better? It's only a problem in maybe 5 seconds of the total video length.
EDIT - the scene is a dark one with an obvious gradient of color (deep blues tones) if that makes any difference or explains why it might be showing up only there and nowhere else in my footage.


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