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ippStsUnderRunErr
This is an input-consumption failure. The primitive expected more bytes, bits, samples, or table entries than the caller made available.
In decoders it often means a truncated packet or an incorrect length passed from the container layer. In streaming code it can also mean that the function was called before enough input was accumulated.
Diagnostic focus
- Log the advertised input length and the number of bytes consumed before the status appeared.
- Check packet reassembly and frame-boundary handling before blaming the codec payload.
- For incremental decoders, distinguish a temporary under-run from a permanently damaged stream.
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