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Try using ffmpeg to convert to gif with a custom palette to make the dithering less obvious. As an example, here's the commands I used to make gif related. The first line creates the palette, and the second uses it to make the gif.
>ffmpeg -i "noefureOUT.mp4" -vf fps=15,scale=320:-1:flags=lanczos,palettegen palette.png
>ffmpeg -i "noefureOUT.mp4" -i palette.png -filter_complex "fps=15,scale=450:-1:flags=lanczos[x];[x][1:v]paletteuse" noefureOUT.gif
