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Why is iPlayer volume quieter than straight to air?


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Old 02-09-2016, 13:42
SepangBlue
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Join Date: Oct 2014
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When catching up on some of the Diamond League athletics recently I had to turn the volume way up to bring the commentary up to the same level as an original broadcast.

I've noticed this to a certain extent on some other shows (EastEnders for instance) which need far more volume on iPlayer than I usually have it when watching them 'live'.

Can anyone explain this anomaly and why it should be so?
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Old 02-09-2016, 14:28
chrisjr
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Join Date: May 2004
Location: Reading
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Several possible reasons.

Audio processing. Audio that has high levels of dynamic range compression will sound louder than the same audio that has not been processed so heavily. That is because the compression raises the average level of the audio making it appear louder even though the maximum peaks are the same.

Simple differences in the levels of broadcast and streaming. It could be that the audio level for broadcast is higher than the streaming version.

The TV could handle audio from the various sources (tuner HDMI sockets web streams) differently so levels are different for each.

I suspect it could be a combination of all three, probably mainly the processing applied. Freeview HD tends to be quieter than the equivalent SD broadcast for the same reason. or at least it sounds like there is less processing on a number of HD programmes compared to the SD version.
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