BIG TUTORIAL - How to fix video posterization (banding) - and a lot more

▼▼ EXPAND FOR NAVIGATION ▼▼
00:00 Explaining the problem - "partial" video causes doubled and skipped values.
14:48 Trying to use digital noise to reduce banding (bleh)
19:08 Experimenting with other textures
23:34 Interlude: Nearest neighbor scaling: It's important, and Premiere doesn't have it.
19:08 Experimenting with other textures (continued)
28:47 Key insight: Order of operations matters!
30:44 Fixing banding in a video that was already rendered
32:39 Interlude: bicubic scaling vs. nearest neighbor

35:46 Fixing banding in a video that was already rendered (continued) Also, how to key a gradient and other complicated stuff
If you want to try this yourself:
Here is the source footage that I will be fixing:
https://youtu.be/O6-PZT4jeJk
Here is my pixel overlay:
https://www.dropbox.com/s/8t1oxu7kh0nffh0/pixel%20overlay.jpg?dl=0
https://www.dropbox.com/s/0j2s1ottsyikzbk/pixel-replicate-7.png?dl=0
Here is a nearly perfect Bionic Beaver background
https://www.dropbox.com/s/6r21fof958bmio8/DITHERED_beaver.png?dl=0

52:18 - Photoshop's fancy RGB dithering
1:06:13 - Discovering that YouTube uses different bitrates in the same resolution

(FYI, banding can also be called "posterization.")

Potentially interesting/useful links:
http://nomorebanding.com/cache
https://graphicdesign.stackexchange.com/questions/8108/is-it-really-impossible-to-have-gradient-without-banding
https://medium.com/@stefanhrlemann/how-to-create-noisy-risograph-style-gradients-and-textures-in-photoshop-in-3-ways-394d6012a93a
http://shunotes.blogspot.com/2015/12/banding-gradient-and-ramp.html
http://www.loopit.dk/banding_in_games.pdf
https://forums.adobe.com/message/10902765#10902765

Playlist of all Taran's tests: (won't be very useful to anyone else, since you don't know the ingredients)
https://www.youtube.com/playlist?list=PLH1gH0v9E3rtQ7HbGseUiM56UDNx6n6jA
In particular, this video was very useful for me to figure out how different sizes of the faux-pixels are affected by different resolutions in YouTube: https://www.youtube.com/watch?v=fLet97r56tE (I'd watch the whole thing with a different resolution each time)
Testing lots of different kinds of overlays: https://www.youtube.com/watch?v=WF_VvrTTNJQ&t=173s

Me and the captain arguing about "partial" video:
https://twitter.com/TaranVH/status/1080232381296963584
Continued:
https://twitter.com/TaranVH/status/1092850961909932032