Tts Audio Mastering

Recommended FFmpeg pattern (example):

• Add filters in a single chain, and keep them consistent across segments.

3. Loudness Normalization

Target loudness depends on the benchmark/task spec. A common target is ITU-R BS.1770 loudness measurement:

• Integrated loudness: -23 LUFS
• True peak: around -1.5 dBTP
• LRA: around 11 (optional)

Recommended workflow:

1. Measure loudness using FFmpeg ebur128 (or equivalent meter).
2. Apply normalization (e.g., loudnorm) as the final step after cleanup and timing edits.
3. If you adjust tempo/duration after normalization, re-normalize again.

4. Timing & Segment Boundary Handling

When stitching segment-level TTS into a full track:

• Match each segment to its target window as closely as possible.
• If a segment is shorter than its window, pad with silence.
• If a segment is longer, use gentle duration control (small speed change) or truncate carefully.
• Always apply boundary fades after padding/trimming to avoid clicks.

Sync guideline: keep end-to-end drift small (e.g., <= 0.2s) unless the task states otherwise.