int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
int mbaff; ///< h264 1 -> MBAFF frame 0-> not MBAFF
int field_picture; ///< whether or not the picture was encoded in seperate fields
+ int sync; ///< has been decoded after a keyframe
int mb_var_sum; ///< sum of MB variance for current frame
int mc_mb_var_sum; ///< motion compensated MB variance for current frame