UK & ROI commercial TV loudness spec
What a file has to measure to pass this spec, and where each figure comes from.
| Check | Required | In LC-1 |
|---|---|---|
| Integrated loudness | −23.0 ±0.5 LUFS | Fixed with a level change |
| True peak | −1.0 dBTP max | Limited, with audition |
| Max short-term | −18.0 LUFS | Flagged |
| Top and tail silence | 6 frames under −70 dBFS | Muted, with audition |
| Length | Exact, at 25 fps | Flagged |
| Format | 48 kHz, 24-bit PCM | Flagged |
Worth knowing
The broadcasters recommend a true peak of −3 dBTP or lower, and a file fails above −1 dBTP. DPP012 gives a tolerance of ±0.2 LU; Clearcast and XR check ±0.5 LU.
Data source(s)
- DPP012 v2.0 (commercial delivery guidance)
- Clearcast Library upload specs v1.5 and its published QC template
- XR UK & ROI spec
Figures taken from the documents above and last read on 10 October 2026.
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