Where the current macroblock comes from; negative value when it comes from the past, positive value when it comes from the future. XXX: set exact relative ref frame reference instead of a +/- 1 "direction".
See Implementation
Where the current macroblock comes from; negative value when it comes from the past, positive value when it comes from the future. XXX: set exact relative ref frame reference instead of a +/- 1 "direction".