MB_TYPE_REF0       93 libavcodec/h264.h #define IS_REF0(a)         ((a) & MB_TYPE_REF0)
MB_TYPE_REF0      392 libavcodec/h264data.h {MB_TYPE_8x8  |MB_TYPE_P0L0|MB_TYPE_P1L0|MB_TYPE_REF0, 4},