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How to remove banding that appears on YouTube but not in After Effects/Premiere

Hi there,

Have a really frustrating problem.

Shot a music video on Canon 5D MkII. It was low light. The settings were

Specs: Monochrome, ISO 2000, 135 mm, F2.0, 1/30 sec.

I have tinted it blue with Colour Balance, then used Remove Grain to get rid of the existing grain ("2.1"), Ramp Scatter to remove some of the banding and then tweaked the curves and added .25 grain back in to smooth over the remaining banding.

The footage looks nice and smooth good in Premiere/After Effects. However, this is what happens each time I upload to YouTube...
https://www.youtube.com/watch?v=y1lgwXqezKY

You can particularly notice the pixelation and banding around 30 seconds -- we were shooting a reflection in a window.

Does anyone have any suggestions? As to how I can improve this image? Particularly the banding?

Many thanks

Jeanette
 
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