a relatively bad way to create a batch file to split files base on level

split.py

import subprocess as sp
import sys
import numpy

FFMPEG_BIN = "ffmpeg.exe"

print ('ASplit.py <src.mp3> <silence duration in seconds> <threshold amplitude 0.0 .. 1.0>')

src = sys.argv[1]
dur = float(sys.argv[2])
thr = int(float(sys.argv[3]) * 65535)

f = open('%s-out.bat' % src, 'wb')

tmprate = 16000
len2 = dur * tmprate
buflen = int(len2     * 2)
#            t * rate * 16 bits

oarr = numpy.arange(1, dtype='int16')
# just a dummy array for the first chunk

command = [ FFMPEG_BIN,
        '-i', src,
        '-f', 's16le',
        '-acodec', 'pcm_s16le',
        '-ar', str(tmprate), # ouput sampling rate
        '-ac', '1', # '1' for mono
        '-']        # - output to stdout

pipe = sp.Popen(command, stdout=sp.PIPE, bufsize=10**8)

tf = True
pos = 0
opos = 0
part = 0

try:
    while tf:

        raw = pipe.stdout.read(buflen)
        if raw == '':
            tf = False
            break

        arr = numpy.frombuffer(raw, dtype="int16")

        rng = numpy.concatenate([oarr, arr])
        mx = numpy.amax(rng)
        if mx <= thr:
            # the peak in this range is less than the threshold value
            trng = (rng <= thr) * 1

            # effectively a pass filter with all samples <= thr set to 0 and > thr set to 1
            sm = numpy.sum(trng)
            # i.e. simply (naively) check how many 1's there were
            print(f"sm {sm} len2 {len2}")
            if sm >= len2:
                part += 1
                apos = pos + dur * 0.5
                #print( mx, sm, len2, apos)
                f.write(f'ffmpeg -i "{src}" -ss {opos} -to {apos} -c copy -y "{src}-p{part}.wav"\r\n'.encode() )
                f.write(f'python -m ffmpeg_normalize "{src}-p{part}.wav" -nt rms -t=-27 -o "{src}-p{part}.wav" -ar 16000 -f\r\n'.encode())
                opos = apos

        pos += dur

        oarr = arr

except OSError as err:
    print("OS error: {0}".format(err))
except ValueError:
    print("Could not convert data to an integer.")
except BaseException as err:
    print(f"Unexpected {err}=, {type(err)}=")

part += 1    
f.write(f'python -m ffmpeg_normalize -i "{src}" -ss {opos} -to {pos} -c copy -y "{src}-p{part}.wav"\r\n'.encode())
f.close()