# note: A pre-processing value of 2, past level reduction.
# expect: reject
# exercises: The second undefined value in the header byte, refused by the
#   same condition in ALPHInit(). All four filter values are legal, so the
#   filter field has no partner to this.
chunks VP8X ALPH VP8
alpha 1
alph_preprocessing 2
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20
coeffs y[2] 1:5 -3