ffmpeg/tests/ref/fate/gif-disposal-background

   1 #tb 0: 1/2
   2 0,          0,          0,        1,    10368, 0x8b200cc8
   3 0,          1,          1,        1,    10368, 0x4e208e4f
   4 0,          2,          2,        1,    10368, 0x044dba8b
   5 0,          3,          3,        1,    10368, 0x1d617e09
   6 0,          4,          4,        1,    10368, 0xae38a6d2