The audio-completeness guard (detect_broken_audio) is the only post-processing
step that fully DECODES the file with ffmpeg, making it the most CPU-heavy step.
Two changes reduce and gate that cost:
1. Single ffmpeg pass: astats (truncation) + silencedetect (silence) now run in
one chained -af filter over a single decode, instead of two full decodes.
~50% less CPU, no detection lost. Pure parsers unchanged.
2. Opt-in toggle: new post_processing.audio_completeness_check (default False).
The decode now only runs when the user enables it under
Settings → Post-processing → Core Features. Most preview/truncation cases are
already caught at the source (HiFi/Qobuz have their own guards), so the
expensive whole-file decode stays off unless explicitly turned on.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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