#!/usr/bin/env python3
from pathlib import Path
R=Path('/data/video-pipeline/GacMaiAudio/project/gacmai_20260717_184527')
C=R/'assets/audio/chunks'
files=sorted(C.glob('[0-9][0-9][0-9][0-9]_*.wav'))
assert len(files)==342
silence=R/'assets/audio/work/silence_2s.wav'
lines=[f"file '{files[0]}'",f"file '{silence}'"]+[f"file '{p}'" for p in files[1:]]
(R/'assets/audio/work/concat.txt').write_text('\n'.join(lines)+'\n')