1 to 232 2, inclusive, shall ignore (remove from the bitstream and discard) it. scene_transition_type specifies in which type of a scene transition (if any) the target pictures are involved. The valid values of scene_transition_type are specified in Table D-4. Table D-4 - scene_transition_typevalues Value Description No transition Fade to black Fade from black Unspecified transition from or to constant colour Dissolve Unspecified mixture of two scenes When scene_transition_type is greater than 3, the target pictures include contents both from the scene labelled by its scene and the next scene, in output order, which is labelled by second_scene_id (see below). The term "the current Rec. ITU-T H.264 (01/2012) scene" is used to indicate the scene labelled by scene_id. The term "the next scene" is used to indicate the scene labelled by second scene id. It is not required for any following picture, in output order, to be labelled with scene_id equal to second_scene_id of the current SEI message. Scene transition types are specified as follows. "No transition" specifies that the target pictures are not involved in a gradual scene transition. NOTE 2 - When two consecutive pictures in output order have scene_transition_type equal to 0 and different values of scene_id, a scene cut occurred between the two pictures. "Fade to black" indicates that the target pictures are part of a sequence of pictures, in output order, involved in a fade to black scene transition, i.e., the luma samples of the scene gradually approach zero and the chroma samples of the scene gradually approach 128. NOTE 3 - When two pictures are labelled to belong to the same scene transition and their scene_transition_type is "Fade to black", the later one, in output order, is darker than the previous one. "Fade from black" indicates that the target pictures are part of a sequence of pictures, in output order, involved in a fade from black scene transition, i.e., the luma samples of the scene gradually diverge from zero and the chroma samples of the scene 