B帧:
B8pdir[i] i为0,1,2,3;值的含义:0:前向 ;1:后向;2:双向;如果为intra_block,则为-1.
B8mode[i] i为0,1,2,3 ,值的含义:1:16x16 2:16x8 3:8x16 0:direct 4:8x8,如果为intra_block则为IBLOCK
P帧:
B8pdir[i] i为0,1,2,3;值的含义:0:前向 ;如果为intra_block,则为-1.
B8mode[i] i为0,1,2,3 ,值的含义:1:16x16 2:16x8 3:8x16 4:8x8,如果为intra_block则为IBLOCK