[Csnd] zero holes with lpanal

Hi,
i hope that someone could tell me why a wave file, in this case finneganswake1.flac from the examples folder, can’t find any poles when analyzing.
Clearly a hole in my knowledge, but i would say a few poles could be detected in any sound file, but 0 poles?

Some of the output:

util lpanal:
Reading sound from finneganswake1.flac, writing lpfile to /media/menno/datae/onderzoek/manualExamples/finneganswake100.lpc
poles=40 hopsize=200 begin= 0.0 duration= 0.0
lpheader comment:

pch track range: 50.0 - 5000.0 Hz
Using pole storage method
audio sr = 44100, monaural
opening FLAC infile finneganswake1.flac
analysing 558868 sample frames (12.7 secs)
Found only 0 poles…sorry
wanted 40 poles

; Select audio/midi flags here according to platform -odac --limiter=0.9 ;;;realtime audio out and limiter ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o scanhammer.wav -W ;;; for file output any platform

sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1

; by Menno Knevel 2021

ires1 system_i 1,{{ lpanal -a -p40 -h200 -P50 -Q5000 -v1 fox.wav fox.lpc }}
ires2 system_i 1,{{ lpanal -a -p40 -h200 -P50 -Q5000 -v1 finneganswake1.flac finneganswake100.lpc }}

instr 1
ilen filelen “fox.wav” ; length of soundfile
prints “fox.wav = %f seconds\n”,ilen

ktime line 0, p3, p4
krmsr,krmso,kerr,kcps lpread ktime,“fox.lpc”
krmso = krmso*.00005 ; low volume
aout buzz krmso, kcps, 15, 1
outs aout, aout ; mix buzz and rand

endin

f1 0 4096 10 1

i 1 0 2.8 2.756667 ; whole sentence

e

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It says

poles=40 hopsize=200 begin= 0.0 duration= 0.0

so no wonder it can’t find any poles if the duration is zero.