When there is 1 pixel per slice for the first half of slices, the
encoder creates buggy slices.
Example:
ffmpeg -f lavfi -i mandelbrot=s=8x8 -vf format=yuv444p -t 1 -c ffv1
-coder 1 -context 0 -g 1 -level 3 -slices 64 -slicecrc 1 a.mkv
ffmpeg -f lavfi -i mandelbrot=s=9x9 -vf format=yuv444p -t
When there is 1 pixel per slice for the first half of slices, the
encoder creates buggy slices.
Example:
ffmpeg -f lavfi -i mandelbrot=s=8x8 -vf format=yuv444p -t 1 -c ffv1
-coder 1 -context 0 -g 1 -level 3 -slices 64 -slicecrc 1 a.mkv
ffmpeg -f lavfi -i mandelbrot=s=9x9 -vf format=yuv444p -t