ppmtoeyuv - convert a portable pixmap into a Berkeley YUV file
Reads a portable pixmap as input. Produces a Berkeley
Encoder YUV (not the same as Abekas YUV) file on the
Standard Output file.
With no argument, takes input from Standard Input.
Otherwise, ppmfile is the file specification of the
ppmtoeyuv handles multi-image PPM input streams,
outputting consecutive eyuv images. There must be at least
one image, though.