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| ### Section 16: Interframe Macroblock Prediction Records {#h-16-00} |
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| We describe the layout and semantics of the prediction records for macroblocks in an interframe. |
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| After the feature specification (which is described in Section 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. |
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