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function writeYUV420file(filename, Y, U, V)
% writeYUV420file(filename, Y, U, V)
fid = fopen(filename,'wb');
if fid==-1
error(['Cannot open file ' filename]);
end
numFrames=size(Y,3);
for k=1:numFrames
% Write luminance
fwrite(fid,uint8(Y(:,:,k).'), 'uchar');
% Write U channel
fwrite(fid,uint8(U(:,:,k).'), 'uchar');
% Write V channel
fwrite(fid,uint8(V(:,:,k).'), 'uchar');
end
fclose(fid);
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