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| #### 9.11 Remaining Frame Header Data (Key Frame) {#h-09-11} |
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| | Index | Description |
| | ------------ | ------------- |
| | `L(1)` | `mb_no_skip_coeff`. This flag indicates at the frame level if skipping of macroblocks with no non-zero coefficients is enabled. If it is set to `0`, then `prob_skip_false` is not read and `mb_skip_coeff` is forced to `0` for all macroblocks (see Sections 11.1 and 12.1). |
| | `L(8)` | `prob_skip_false` = Probability used for decoding a macroblock-level flag, which indicates if a macroblock has any non-zero coefficients. Only read if `mb_no_skip_coeff` is `1`. |
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| Decoding of this portion of the frame header is handled in the reference decoder file `modemv.c` (Section 20.11). |
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| This completes the layout of the frame header. The remainder of the |
| first data partition consists of macroblock-level prediction data. |
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| After the frame header is processed, all probabilities needed to |
| decode the prediction and residue data are known and will not change |
| until the next frame. |
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