# note: An ALPH chunk in a RIFF file with no VP8X ahead of it.
# expect: reject
# exercises: The extended format is what an ALPH chunk lives in: libwebp only
#   accepts a leading ALPH when there is no RIFF header at all, the bare stream
#   case. With RIFF and no VP8X it is refused.
chunks ALPH VP8
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20
coeffs y[2] 1:5 -3