def normalize(input_file):
temp_dir = tempfile.mkdtemp()
transcoded_file = os.path.join(temp_dir, 'transcoded.flac')
ffmpeg.transcode(input_file, transcoded_file)
args_keep_silence = False
args_silence_min_duration_sec = 0.1
args_silence_threshold = 0.5
if not args_keep_silence:
trimmed_file = os.path.join(temp_dir, 'trimmed.flac')
sox.remove_silence(
transcoded_file,
trimmed_file,
min_duration_sec=args_silence_min_duration_sec,
threshold=args_silence_threshold)
else:
trimmed_file = transcoded_file
duration = sox.get_duration(trimmed_file)
duration = int((duration // FRAGMENT_DURATION) * FRAGMENT_DURATION)
normalized_file = os.path.join(temp_dir, 'normalized.flac')
sox.normalize(trimmed_file, normalized_file, duration_in_sec=duration)
return normalized_file, temp_dir
def execute(self, context):
input_files = context[self.input_files_key]
output_files = context[self.output_files_key] = []
for index, input_file in enumerate(input_files):
output_file = common.append_suffix_to_filename(
input_file, Normalizer.SUFFIX)
output_files.append(output_file)
volume = None
sox.normalize(
input_file,
output_file,
volume=volume,
offset_in_sec=self.offset_in_sec,
duration_in_sec=self.duration_in_sec)