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ippStsLSFLow
This warning says the quantized line spectral frequency stability check touched the lower boundary of the valid interval. IPP adjusted or constrained the value so the synthesis filter remains usable.
It is not necessarily a fatal decoder error, but it is a signal-quality clue. Repeated low-boundary clipping can indicate poor quantization, wrong frame mode or damaged speech parameters.
Check these details
- LSF values close to zero.
- Minimum spacing enforced by the codec or IPP routine.
- Whether the frame has bit errors or a mismatched mode.
Intel IPP Error Reporting · Intel IPP Signal Processing Reference · ITU-T G.729 speech coding
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