ing is vertical flipping. When frame_packing arrangement_type is not equal to 3 or 4, it is a requirement of bitstream conformance that spatial_flipping_flag be equal to 0. When frame_packing_arrangement_type is not equal to 3 or 4, the value 1 for spatial_flipping_flag is reserved for future use by ITU-T ISO/IEC. When rame_packing_arrangement_type is not equal to 3 or 4, decoders shall ignore the value 1 for spatial_flipping_flag. frame0_flipped_flag. when spatial_flipping_flag is equal to 1, indicates which one of the two constituent frames is flipped. When spatial_flipping_flag is equal to 1, frame0_flipped_flag to 0 indicates that frame 0 is not spatially flipped and frame 1 is spatially flipped, and frame0_flipped_flag equal to 1 indicates that frame 0 is spatially flipped and frame is not spatially flipped. When ial_flipping_ flag is equal to 0, it is a requirement of bitstream conformance that frame0_flipped_flag shall be equal to 0. When spatial_flipping_flag is equal to 0, the value 1 for spatial_flipping_flag is reserved for future use by ITU-T ISO/IEC. When spatial_flipping_flag equal to 0, decoders shall ignore the value of frame0_flipped_flag. field_views_flag equal to 1 indicates that all pictures in the current coded video sequence are coded as complementary field pairs. All fields of a particular parity are considered a first constituent frame and all fields of the opposite parity are considered a second constituent frame. When frame king_arrangement type is not equal to 2, it is a requirement of bitstream conformance that the field_views_flag shall be equal to 0. When frame_packing_arrangement_type is not equal to 2, the value 1 for field_views_flag is reserved for future use by ITU-T ISO/IEC. When frame packing_arrangement_type is not equal to 2, decoders shall ignore the value of field_views_flag. current_frame_is_frame0_flag equal to 1, when frame_packing_arrangement is equal to 5, indicates that the current decoded frame is constituent frame 0 and the next decoded frame in output order is con