FFMPEG An Intermediate Guide/cmp

-cmp <string or int> : Full pel motion estimation compare function. sad ( 0 ) : Sum of absolute differences, fast ( default ). sse ( 1 ) : Sum of squared errors. satd ( 2 ) : Sum of absolute Hadamard transformed differences. dct ( 3 ) : Sum of absolute DCT transformed differences. psnr ( 4 ) : Sum of squared quantization errors ( avoid, low quality ). bit ( 5 ) : Number of bits needed for the block. rd ( 6 ) : Rate distortion optimal, slow. zero ( 7 ) : 0. vsad ( 8 ) : Sum of absolute vertical differences. vsse ( 9 ) : Sum of squared vertical differences. nsse ( 10 ) : Noise preserving sum of squared differences. w53 ( 11 ) : 5/3 wavelet ( only used in Snow ). w97 ( 12 ) : 9/7 wavelet ( only used in Snow ). dctmax ( 13 ) chroma ( 14 )