53 lines
1.8 KiB
Python
Executable File
53 lines
1.8 KiB
Python
Executable File
#!/usr/bin/env python3
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# ffmpeg-album-normalise: Normalise music album-by-album using FFmpeg loudnorm
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# Copyright © 2019 Lee Yingtong Li (RunasSudo)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import argparse
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import json
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import os.path
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import subprocess
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import sys
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parser = argparse.ArgumentParser(description='Scan audio files for loudness')
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parser.add_argument('filename', nargs='+', help='Input files')
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parser.add_argument('--levels', '-l', default='levels.json', help='levels.json output file')
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args = parser.parse_args()
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levels = {}
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if os.path.exists(args.levels):
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with open(args.levels, 'r') as f:
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levels = json.load(f)
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for filename in args.filename:
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print(filename)
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if filename in levels:
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continue
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proc = subprocess.run(['ffmpeg', '-i', filename, '-filter:a', 'loudnorm=print_format=json', '-f', 'null', '-'], capture_output=True, encoding='utf-8')
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if proc.returncode != 0:
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print('FFmpeg error')
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sys.exit(1)
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data_str = proc.stderr[proc.stderr.index('{', proc.stderr.index('Parsed_loudnorm_0')):]
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data = json.loads(data_str)
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levels[filename] = data
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with open(args.levels, 'w') as f:
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json.dump(levels, f)
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