Posted on 13 December 2019 | 6:19 pm
The short answer: -14 LKFS/-1.1 dBTP.
On the dB scale:
-1 dB from peak gives a smidge of headroom without clipping.
-1.1 affords a little extra room for compression. The quantitative rounding in an MP3 can result in a .1 db error.
On the loudness side of things:
-14 LKFS (loudness weighted full scale)..
What the bleep is LKFS? It’s a measurement of perceived loudness outlined in ATSC A/85 in the US. That describes TV broadcast standards for us. It’s aimed at normalizing the sound levels between channels and mixed content such as commercials. Netflix standards are -24 LKFS and -2 dB.
YouTube’s official videos are around -14 LKFS.
Why does it matter? Because two artists can master a mix with the same material at -1db yet perceptually sound very different in loudness. An example would be using heavy compression versus a mix with more dynamic headroom. Secondly, it avoids the streaming services audio normalization processing your audio in a way you did not intend.
If you right click on a YouTube video and select "Stats for nerds" you can see the volume position of the player, the volume of what Google is actually playing the media back at, and the difference in dB it was adjusted. I'm not sure if Brightcove does such adjustments on the fly, but the point would be to standardize volume levels to keep viewers from reaching for the controls when viewing our content.
So when finishing audio, check the 'loudness' as well as the dB scale. Loudness can be measured with the "Loudness Radar" audio effect in both Premiere and Audition.
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Visit the site.
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Visit the site.
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