Writing array to AVI using writeVideo

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SteveH
SteveH 2016-3-4
I have double array I convert using I8bit = uint8(I); Here is snippet of my code that works:
vidProfile = 'Grayscale AVI' ;
v = VideoWriter(fname,vidProfile);
open(v);
writeVideo(v,I8bit);
close(v);
This provides no compression. If I try other profiles such as 'Archival' I get this error: 'Error using VideoWriter/writeVideo (line 408) IMG must be an array of either grayscale or RGB images.'
How do I compress 8bit grayscale for AVI?

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