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### Chapter 16: Interframe Macroblock Prediction Records {#h-16-00}
We describe the layout and semantics of the prediction records for macroblocks in an interframe.
After the feature specification (which is described in Chapter 10 and is identical for intraframes and interframes), there comes a Bool( prob_intra), which indicates inter-prediction (i.e., prediction from prior frames) when true and intra-prediction (i.e., prediction from already-coded portions of the current frame) when false. The zero-probability `prob_intra` is set by field J of the frame header.