Sermon-clean v0.2.0. Five new subcommands that round out the editor:
- normalize (norm): Apply EBU R128 two-pass loudness normalization.
Default -16 LUFS (podcast/YouTube). Configurable target LUFS, true
peak, and loudness range. Output reports measured input loudness
and applied gain offset.
- silence-stats (ss): Quantitative summary of silence distribution —
count, total/mean/median/longest silence, silence fraction, and
silence runs per minute. Outputs JSON via --json. Useful for
comparing recordings and picking the right threshold.
- threshold-tune (tt): Auto-pick the silence threshold for the audio.
Scans a set of candidate thresholds (default -25..-50), scores each
against the target silence-runs-per-minute (default 4.0), picks the
closest match. Shows the full scoring table.
- denoise: Apply ffmpeg's afftdn filter for light FFT-based noise
reduction. Configurable noise reduction dB (default 12) and noise
floor dB (default -50). Output at 48kHz to match normalize.
- batch: Run any of the subcommands across many files via glob.
Output goes to --output-dir with --suffix (default '-fixed') and
optional --extension override. Failures are collected, not raised
— one bad file doesn't kill the whole batch.
Implementation:
- sermon_clean/processing.py: normalize_loudness + SilenceStats
dataclass + silence_stats + threshold_tune.
- sermon_clean/denoise.py: DenoiseResult + denoise.
- sermon_clean/batch.py: run_batch + _expand_globs + _make_output_path.
- sermon_clean/cli.py: 5 new cmd_* functions + 5 subparser registrations.
Tests:
- tests/test_processing.py (7 tests): silence-stats on silent vs loud,
threshold-tune picks closest, normalize produces output + measures loud.
- tests/test_denoise_batch.py (11 tests): denoise roundtrip, batch
helpers (glob expansion, output naming), batch run with normalize
+ denoise, unknown subcommand raises, one-bad-file-in-batch continues.
Total: 82/82 tests passing in 48s (was 64/64). Bumped version to 0.2.0.
README updated: step-by-step workflow adds 1d-1g; subcommand table
adds the 5 new commands; new 'Batch processing' section.
Hermes Agent
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