he full-frame freeze SEI message persists 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) and less than or equal to PicOrderCnt( CurrPic ) + full_frame_freeze_repetition_period. full_frame_freeze_repetition_period greater than 1 indicates that another full-frame freeze SEI message or a full-frame freeze release SEI message shall be present for a picture in an access unit that is output having PicOrderCnt() greater than PicOrderCnt( CurrPic ) and less than or equal to PicOrderCnt( CurrPic + full_frame_freeze_repetition_period; unless the bitstream ends or a new coded video sequence begins without output of such a picture. D.2.15 Full-frame freeze release SEI message semantics The full-frame freeze release SEI message cancels the effect of any full-frame freeze SEI message sent with pictures that precede the current picture in output order. The full-frame freeze release SEI message indicates that the current picture and subsequent pictures in output order should affect the contents of the display. No more than one full-frame freeze release SEI message shall be present in any access unit. A full-frame freeze release SEI message shall not be present in an access unit containing a full-frame freeze SEI message. When a full-frame freeze SEI message is present in an access unit containing a field of a complementary field pair in which the values of PicOrderCnt( CurrPic ) for the two fields of the complementary field pair are equal to each other, a full-frame freeze release SEI message shall not be present in either of the two access units. Rec. ITU-T H.264 (01/2012) D.2.16 Full-frame snapshot SEI message semantics The full-frame snapshot SEI message indicates that the current frame is labelled for use as determined by the application as a still-image snapshot of the video content. snapshot_io specifies a snap