The block size should honestly be tuned for the codec in use, chiefly to determine the best block size to fit with the codec's macroblock size. That's usually e

The block size should honestly be tuned for the codec in use, chiefly to determine the best block size to fit with the codec's macroblock size. That's usually either 8x8, or with newer codecs 16x16. I feel like something like maybe 8x2 would be smart, and I like the idea of monochrome for resiliency, since chroma is downsampled. The fewer possible pixel combinations you have within a macroblock, the better the compression will probably end up being as well. And 8x2 would somewhat evoke the look of the old video backup systems as well, for the fun of the nostalgia of that.