cture in decoding order precedes the first picture of the target sub-sequence in decoding order. Otherwise (ref_sub_seq_direction is equal to 1), a set of candidate sub-sequences consists of the sub-sequences which have a value of sub_seq_id equal to ref_sub_seq_id, which reside in the sub-sequence layer having sub_seq_layer_num equal to ref_sub_seq_layer_num, and for which the first picture in decoding order succeeds the first picture of the target sub-sequence in decoding order. The sub-sequence used as a reference for the target sub-sequence is the sub-sequence among the set of candidate sub-sequences for which the first picture is the closest to the first picture of the target sub-sequence in decoding order. D.2.14 Full-frame freeze SEI message semantics The full-frame freeze SEI message indicates that the current picture and any subsequent pictures in output order that meet specified conditions should not affect the content of the display. No more than one full-frame freeze SEI message shall be present in any access unit. full_frame_freeze_repetition_periodspecifies the persistence of the full-frame freeze SEI message and may specify a picture order count interval within which another full-frame freeze SEI message or a full-frame freeze release SEI message or the end of the coded video sequence shall be present in the bitstream. The value of full_frame_freeze_repetition_period, shall be in the range of 0 to 16 384, inclusive. full_frame_freeze_repetition_period equal to 0 specifies that the full-frame freeze SEI message applies to the current decoded picture only. full_frame_freeze_repetition_period equal to 1 specifies that the full-frame freeze SEI message persists in output order until any of the following conditions are true: A new coded video sequence begins. A picture in an access unit containing a full-frame freeze SEI message or a full-frame freeze release SEI message is output having PicOrderCnt() greater than PicOrderCnt( CurrPic ). ull_frame_freeze_repetition_period greater than 1 specifies that t