# note: A frame carrying an alpha chunk and no image.
# expect: reject
# anim: reject
# info: reject
# exercises: The ALPH arm of StoreFrame() sets frame_num where the image arm
#   would have, so unlike anim-empty-frame this frame is kept: it has an
#   alpha component, no image component, and the width and height the ANMF
#   header claimed. That is enough to pass every test in
#   IsValidExtendedFormat(), which only refuses a frame with neither. The
#   decoder is then handed an ALPH chunk to decode as an image.
alpha 1
frame
frame_duration 100
chunks ALPH
alph_raw
width 16
height 16
yac_qi 30
macroblock
coeffs y2 -20