rmative: A term used to refer to content provided in this Recommendation | International Standard that is not an integral part of this Recommendation | International Standard. Informative content does not establish any mandatory requirements for conformance to this Recommendation International Standard. instantaneous decoding refresh (IDR) access unit: An access unit in which the primary coded picture is an IDR picture. instantaneous decoding refresh (IDR) picture: A coded picture for which the variable IdrPicFlag is equal to 1. An IDR picture causes the decoding process to mark all reference pictures as "unused for reference" immediately after the decoding of the IDR picture. All coded pictures that follow an IDR picture in decoding order can be decoded without inter prediction from any picture that precedes the IDR picture in decoding order. The first picture of each coded video sequence in decoding order is an IDR picture. inter coding: Coding of a block, macroblock, slice, or picture that uses inter prediction. inter prediction: A prediction derived from decoded samples of reference pictures other than the current decoded picture. interpretation sample value: A possibly-altered value corresponding to a decoded sample value of an auxiliary coded picture that may be generated for use in the display process. Interpretation sample values are not used in the decoding process and have no normative effect on the decoding process. intra coding: Coding of a block, macroblock, slice, or picture that uses intra prediction. Rec. ITU-T H.264 (01/2012) intra prediction: A prediction derived from the decoded samples of the same decoded slice. intra slice: See I slice. inverse transform: A part of the decoding process by which a set of transform coefficients are converted into spatial-domain values, or by which a set of transform coefficients are converted into DC transform coefficients. layer: One of a set of syntactical structures in a non-branching hierarchical relationship. Higher layers contain lower layers. The coding 