Streaming reference / loudness · Standards-based explanation; no UK IPTV delivery implementation verified. Instructions are based on publisher guidance; a UK IPTV account was not tested on this platform.
Recognise the practical problem
You switch between two lawful programmes without touching the remote, yet one sounds much louder. A peak meter alone may not explain that difference. Short transients and sustained dialogue or music contribute differently to the listening impression. This is the problem addressed by programme-loudness normalisation: a meaningful comparison needs more than the single largest sample peak found in the audio.
Understand what the production recommendation does
EBU R 128 describes a programme-loudness approach together with permitted maximum signal levels. Its practical guidance distinguishes loudness normalisation from peak normalisation. That production recommendation is useful context, but it is not evidence that a particular stream follows it. Avoid announcing compliance based on a broadcaster name, a logo or the fact that a television has its volume set to the same number.
Keep viewer controls separate
A television’s volume control changes listening level at the output. Dialogue enhancement and dynamic-range controls can change the balance or spread of perceived loudness in ways that differ from source-side programme normalisation. Before comparing two sources, note which processing modes are active and use a comfortable level. Do not turn everything to maximum while searching for a measurement that belongs in a professional production workflow.
Describe the issue precisely
Report whether the whole programme is consistently louder, adverts jump in level, dialogue is hard to follow or occasional effects are startling. These are different observations. If practical, compare the same scene through the same output path and restore the original setting after a test. A useful report identifies the programme and time without claiming a standards breach that has not been measured against the relevant delivery specification.
Questions, answered
Will setting both programmes to the same peak make them sound identical?
Not necessarily. Programme loudness considers more than the highest instantaneous peak, and the listener’s playback processing and environment also affect the result.