# note: An uncompressed plane one byte short of the picture.
# expect: reject
# exercises: The other side of that same test, one byte away: 255 bytes where
#   a 16x16 picture needs 256.
chunks VP8X ALPH VP8
alpha 1
alph_raw 255
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20
coeffs y[2] 1:5 -3