blog/Measuring_and_adjusting_the_loudness_of_a_TV_channel_using_bs1770gain.html

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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
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  22     <div class="entry">
  23       <div class="title">Measuring and adjusting the loudness of a TV channel using bs1770gain</div>
  24       <div class="date">11th June 2015</div>
  25       <div class="body"><p>Television loudness is the source of frustration for viewers
  26 everywhere.  Some channels are very load, others are less loud, and
  27 ads tend to shout very high to get the attention of the viewers, and
  28 the viewers do not like this.  This fact is well known to the TV
  29 channels.  See for example the BBC white paper
  30 "<a href="http://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP202.pdf">Terminology
  31 for loudness and level dBTP, LU, and all that</a>" from 2011 for a
  32 summary of the problem domain.  To better address the need for even
  33 loadness, the TV channels got together several years ago to agree on a
  34 new way to measure loudness in digital files as one step in
  35 standardizing loudness.  From this came the ITU-R standard BS.1770,
  36 "<a href="http://www.itu.int/rec/R-REC-BS.1770/en">Algorithms to
  37 measure audio programme loudness and true-peak audio level</a>".</p>
  38
  39 <p>The ITU-R BS.1770 specification describe an algorithm to measure
  40 loadness in LUFS (Loudness Units, referenced to Full Scale). But
  41 having a way to measure is not enough.  To get the same loudness
  42 across TV channels, one also need to decide which value to standardize
  43 on.  For European TV channels, this was done in the EBU Recommondaton
  44 R128, "<a href="https://tech.ebu.ch/docs/r/r128.pdf">Loudness
  45 normalisation and permitted maximum level of audio signals</a>", which
  46 specifies a recommended level of -23 LUFS.  In Norway, I have been
  47 told that NRK, TV2, MTG and SBS have decided among themselves to
  48 follow the R128 recommondation for playout from 2016-03-01.</p>
  49
  50 <p>There are free software available to measure and adjust the loudness
  51 level using the LUFS.  In Debian, I am aware of a library named
  52 <a href="https://tracker.debian.org/pkg/libebur128">libebur128</a>
  53 able to measure the loudness and since yesterday morning a new binary
  54 named <a href="http://bs1770gain.sourceforge.net">bs1770gain</a>
  55 capable of both measuring and adjusting was uploaded and is waiting
  56 for NEW processing.  I plan to maintain the latter in Debian under the
  57 <a href="https://qa.debian.org/developer.php?email=pkg-multimedia-maintainers%40lists.alioth.debian.org">Debian
  58 multimedia</a> umbrella.</p>
  59
  60 <p>The free software based TV channel I am involved in,
  61 <a href="http://www.frikanalen.no/">Frikanalen</a>, plan to follow the
  62 R128 recommondation ourself as soon as we can adjust the software to
  63 do so, and the bs1770gain tool seem like a good fit for that part of
  64 the puzzle to measure loudness on new video uploaded to Frikanalen.
  65 Personally, I plan to use bs1770gain to adjust the loudness of videos
  66 I upload to Frikanalen on behalf of <a href="http://www.nuug.no/">the
  67 NUUG member organisation</a>.  The program seem to be able to measure
  68 the LUFS value of any media file handled by ffmpeg, but I've only
  69 successfully adjusted the LUFS value of WAV files.  I suspect it
  70 should be able to adjust it for all the formats handled by ffmpeg.</p>
  71 </div>
  72
  73       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen</a>, <a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia</a>, <a href="http://people.skolelinux.org/pere/blog/tags/video">video</a>.</div>
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