+ <div class="entry">
+ <div class="title"><a href="http://people.skolelinux.org/pere/blog/Measuring_and_adjusting_the_loudness_of_a_TV_channel_using_bs1770gain.html">Measuring and adjusting the loudness of a TV channel using bs1770gain</a></div>
+ <div class="date">11th June 2015</div>
+ <div class="body"><p>Television loudness is the source of frustration for viewers
+everywhere. Some channels are very load, others are less loud, and
+ads tend to shout very high to get the attention of the viewers, and
+the viewers do not like this. This fact is well known to the TV
+channels. See for example the BBC white paper
+"<a href="http://downloads.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP202.pdf">Terminology
+for loudness and level dBTP, LU, and all that</a>" from 2011 for a
+summary of the problem domain. To better address the need for even
+loadness, the TV channels got together several years ago to agree on a
+new way to measure loudness in digital files as one step in
+standardizing loudness. From this came the ITU-R standard BS.1770,
+"<a href="http://www.itu.int/rec/R-REC-BS.1770/en">Algorithms to
+measure audio programme loudness and true-peak audio level</a>".</p>
+
+<p>The ITU-R BS.1770 specification describe an algorithm to measure
+loadness in LUFS (Loudness Units, referenced to Full Scale). But
+having a way to measure is not enough. To get the same loudness
+across TV channels, one also need to decide which value to standardize
+on. For European TV channels, this was done in the EBU Recommondaton
+R128, "<a href="https://tech.ebu.ch/docs/r/r128.pdf">Loudness
+normalisation and permitted maximum level of audio signals</a>", which
+specifies a recommended level of -23 LUFS. In Norway, I have been
+told that NRK, TV2, MTG and SBS have decided among themselves to
+follow the R128 recommondation for playout from 2016-03-01.</p>
+
+<p>There are free software available to measure and adjust the loudness
+level using the LUFS. In Debian, I am aware of a library named
+<a href="https://tracker.debian.org/pkg/libebur128">libebur128</a>
+able to measure the loudness and since yesterday morning a new binary
+named <a href="http://bs1770gain.sourceforge.net">bs1770gain</a>
+capable of both measuring and adjusting was uploaded and is waiting
+for NEW processing. I plan to maintain the latter in Debian under the
+<a href="https://qa.debian.org/developer.php?email=pkg-multimedia-maintainers%40lists.alioth.debian.org">Debian
+multimedia</a> umbrella.</p>
+
+<p>The free software based TV channel I am involved in,
+<a href="http://www.frikanalen.no/">Frikanalen</a>, plan to follow the
+R128 recommondation ourself as soon as we can adjust the software to
+do so, and the bs1770gain tool seem like a good fit for that part of
+the puzzle to measure loudness on new video uploaded to Frikanalen.
+Personally, I plan to use bs1770gain to adjust the loudness of videos
+I upload to Frikanalen on behalf of <a href="http://www.nuug.no/">the
+NUUG member organisation</a>. The program seem to be able to measure
+the LUFS value of any media file handled by ffmpeg, but I've only
+successfully adjusted the LUFS value of WAV files. I suspect it
+should be able to adjust it for all the formats handled by ffmpeg.</p>
+</div>
+ <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>
+ </div>
+ <div class="padding"></div>
+
<div class="entry">
<div class="title"><a href="http://people.skolelinux.org/pere/blog/Hva_gj_r_at_NRK_kan_distribuere_H_264_video_uten_patentavtale_med_MPEG_LA_.html">Hva gjør at NRK kan distribuere H.264-video uten patentavtale med MPEG LA?</a></div>
<div class="date">10th June 2015</div>
</div>
<div class="padding"></div>
- <div class="entry">
- <div class="title"><a href="http://people.skolelinux.org/pere/blog/The_Citizenfour_documentary_on_the_Snowden_confirmations_to_Norway.html">The Citizenfour documentary on the Snowden confirmations to Norway</a></div>
- <div class="date">28th February 2015</div>
- <div class="body"><p>Today I was happy to learn that the documentary
-<a href="https://citizenfourfilm.com/">Citizenfour</a> by
-<a href="https://en.wikipedia.org/wiki/Laura_Poitras">Laura Poitras</a>
-finally will show up in Norway. According to the magazine
-<a href="http://montages.no/">Montages</a>, a deal has finally been
-made for
-<a href="http://montages.no/nyheter/snowden-dokumentaren-citizenfour-far-norsk-kinodistribusjon/">Cinema
-distribution in Norway</a> and the movie will have its premiere soon.
-This is great news. As part of my involvement with
-<a href="http://www.nuug.no/">the Norwegian Unix User Group</a>, me and
-a friend have
-<a href="http://www.nuug.no/news/Dokumentar_om_Snowdenbekreftelsene_til_Norge_.shtml">tried
-to get the movie to Norway</a> ourselves, but obviously
-<a href="http://www.nuug.no/news/Dokumentar_om_Snowdenbekreftelsene_endelig_til_Norge_.shtml">we
-were too late</a> and Tor Fosse beat us to it. I am happy he did, as
-the movie will make its way to the public and we do not have to make
-it happen ourselves.
-<a href="https://www.youtube.com/watch?v=XiGwAvd5mvM">The trailer</a>
-can be seen on youtube, if you are curious what kind of film this
-is.</p>
-
-<p>The whistle blower Edward Snowden really deserve political asylum
-here in Norway, but I am afraid he would not be safe.</p>
-</div>
- <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/nuug">nuug</a>, <a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern</a>, <a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance</a>.
-
-
- </div>
- </div>
- <div class="padding"></div>
-
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