[characterization] Clipping in P.800 processing

While running processing for P800 tests at -16 LKFS, e.g. P800-11 cat 1, resulting in warnings as follows:

Warning: 32 samples clipped while writing \AppData\Local\Temp\2\tmpvd4sf87b\tmp_input_signal.raw!

It might be good to investigate if this is as expected or if there is some unexpected issue.