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41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
#!/usr/bin/env python3
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"""Create normal, long-pause and background-noise variants from one WAV."""
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import argparse
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import subprocess
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from pathlib import Path
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parser = argparse.ArgumentParser()
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parser.add_argument("source", type=Path)
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parser.add_argument("output_dir", type=Path)
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args = parser.parse_args()
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args.output_dir.mkdir(parents=True, exist_ok=True)
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duration = float(subprocess.check_output([
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"ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "csv=p=0", str(args.source)
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], text=True).strip())
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split = duration * 0.55
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normal = args.output_dir / "normal.wav"
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pause = args.output_dir / "long_pause.wav"
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noise = args.output_dir / "background_noise.wav"
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subprocess.run(["ffmpeg", "-y", "-loglevel", "error", "-i", str(args.source), "-ar", "16000", "-ac", "1", str(normal)], check=True)
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filter_pause = (
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f"[0:a]atrim=0:{split},asetpts=PTS-STARTPTS[a];"
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f"[0:a]atrim={split},asetpts=PTS-STARTPTS[b];"
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"anullsrc=r=16000:cl=mono:d=0.9[s];[a][s][b]concat=n=3:v=0:a=1[out]"
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)
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subprocess.run([
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"ffmpeg", "-y", "-loglevel", "error", "-i", str(normal), "-filter_complex", filter_pause,
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"-map", "[out]", str(pause)
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], check=True)
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subprocess.run([
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"ffmpeg", "-y", "-loglevel", "error", "-i", str(normal),
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"-f", "lavfi", "-i", f"anoisesrc=color=pink:amplitude=0.12:d={duration}",
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"-filter_complex", "[0:a][1:a]amix=inputs=2:duration=first:weights='1 1'[out]",
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"-map", "[out]", "-ar", "16000", "-ac", "1", str(noise)
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], check=True)
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print(normal)
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print(pause)
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print(noise)
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