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YouTube upload badly distorts high-quality rendering – tips?
I used Sony Vegas Pro 13 to create an animated video in which all the visual material came from relatively high quality photographic images. As a total beginner, I began by simply zooming in to details, creating movement by panning, and obtaining richer textures and colours by superimposing (layering) various images simultaneously. As I progressed, I learned how to use various Fx, and combined them in more and more ways.
Here is the full video, as an mp4: https://ln.sync.com/dl/2e952e050/mqgsd637-2zv6wghq-n2mh584d-h5w2fxsm
Here is a slightly more recent version, in m2t format, that was uploaded to YouTube: https://www.youtube.com/watch?v=24D9tVqNt-w
You will notice that the YouTube version creates a lot of distortion. I am wondering why — and whether there is anything I can do to fix the situation.
(In case this may be related, you can find the original photographs that were used at the bottom of my webpage (that is dedicated to this music and video), https://thinkingmusic.ca/all .)Here are the Sony Vegas project properties I used:

And here are the mp4 rendering settings I used:

I also uploaded the mp4 version to YouTube, but it was even more distorted.
I also rendered with 4k settings, but all that did was make the YouTube distortions “crisper”.It took me a year to create this video, and it is disappointing to see it distorted like this on YouTube, so any suggestions as to how I might improve results would be very welcome! Thanks in advance!
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