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 1 -c ffv1
-coder 1 -context 0 -g 1 -level 3 -slices 64 -slicecrc 1 a.mkv
ffmpeg -f lavfi -i mandelbrot=s=10x10 -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=11x11 -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=12x12 -vf format=yuv444p -t 1 -c ffv1
-coder 1 -context 0 -g 1 -level 3 -slices 64 -slicecrc 1 a.mkv
then for each file:
ffmpeg -i a.mkv
[ffv1 @ 000001977d8ee240] bytestream end mismatching by -1
etc
This patch is an hotfix for preventing the encoder to create such stream.
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