I can do the task in a few hours. I have checked the youtube video and can see the problem.
I have experiences with video compression. You can check further my profile page.
I can give Teamviewer file transfer login to upload the file to me to process it.
Thank you for considering my application.
// UPDATE: I can even separate each frames, do the highest quality Lanczos-8 resize, then recombine all frames to the video file. //