Intel IPP status -168 (ippStsMBStepErr): meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: IPP reports a macroblock step smaller than the expected 16-sample layout.

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ippStsBlockStepErr	ippStsAacPrgNumErr

ippStsMBStepErr

This status belongs to macroblock-based video primitives. A macroblock operation needs a row step large enough for a 16-sample luma block, plus the codec-specific chroma layout used by the function.

If the step is too small, motion compensation or transform reconstruction could read rows as if they overlapped.

Diagnostic focus

Check the luma and chroma plane steps used for the macroblock operation.
Verify that cropped or padded frame views still expose a full macroblock region.
Do not confuse macroblock step with frame width; the step describes memory stride.

IPP error reporting

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