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<title>The CELT ultra-low delay audio codec: News</title>
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<h1>CELT News</h1>
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<h3>Version 0.11.0 and 0.11.1 released</h3>
<p class="submitdate">15 February, 2011</p>
<div class="description">
<p>CELT 0.11.0 (originally not announced) and 0.11.1 has been released with a focus on freezing the bit-stream and updating the API. The bit-stream is now in "soft-freeze" state meaning there is an attempt to keep it fixed, but some bugs may force changes. Version 0.11 includes some minor quality improvements, mostly at high bit-rate. In version 0.11.1, some minor changes to the bit-stream were necessary to address two minor bugs in 0.11. The quality should improve (very) slightly, but not enough to be noticeable in most cases. Several Opus-related bugs have also been fixed.</p>
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<li>
<h3>Version 0.10.0 released</h3>
<p class="submitdate">21 December, 2010</p>
<div class="description">
<p>CELT 0.10.0 has been released with a focus on quality improvements. The bit-stream is <b>not</b> compatible with version 0.9.x. See <a href="http://people.xiph.org/~xiphmont/demo/celt/demo.html">Monty's CELT demo page</a> for more details on recent (and less recent) CELT development.</p>
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<li>
<h3>Version 0.9.1 released</h3>
<p class="submitdate">8 November, 2010</p>
<div class="description">
<p>CELT 0.9.1 greatly improves the packet loss concealment.
This change is especially dramatic in fixed point mode. The bit-stream is compatible with 0.9.0.</p>
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<li>
<h3>Version 0.9.0 released</h3>
<p class="submitdate">6 November, 2010</p>
<div class="description">
<p>CELT 0.9.0 mainly focuses on quality improvements. The transient handling
code has been greatly improved and high-frequency artefacts have been reduced.
There have also been lots of small improvements from better tuning of various
parameters.</p>
</div>
</li>
<li>
<h3>Version 0.8.1 released</h3>
<p class="submitdate">8 July, 2010</p>
<div class="description">
<p>CELT 0.8.1 fixes some bugs introduced in 0.8.0. The bit-stream remains
compatible with 0.8.0, with the caveat that CELT no longer supports frame
sizes that have prime factors larger than 5. This should not affect any
reasonable application.</p>
</div>
</li>
<li>
<h3>Version 0.8.0 released</h3>
<p class="submitdate">2 July, 2010</p>
<div class="description">
<p>Version 0.8.0 has been released, with improvements for high bit-rates
and for transients in general. It also adds the possibility of changing the
frame size dynamically, which requires a minor change in the API. At last,
the new PLC algorithm from 0.7.1 is now enabled for the fixed-point builds as well.
Version 0.8.0 is <b>not</b> bit-stream compatible with previous releases.</p>
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</li>
<li>
<h3>Version 0.7.1 released</h3>
<p class="submitdate">20 January, 2010</p>
<div class="description">
<p>Version 0.7.1 has been released, with improvements to the packet loss concealment (PLC). It is the first release
<b>not</b> to break bit-stream compatibility with the previous release (0.7.0). But
I promise not to do it again, the next CELT release will likely break
compatibility once again.</p>
</div>
</li>
<li>
<h3>Version 0.7.0 released</h3>
<p class="submitdate">26 October, 2009</p>
<div class="description">
<p>Version 0.7.0 has been released, with improvements to the stereo and low birate audio quality. API is incompatible with previous releases.</p>
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<li>
<h3>Version 0.6.1 released</h3>
<p class="submitdate">13 July, 2009</p>
<div class="description">
<p>Version 0.6.1 has been released, with improvements to the stereo mode. The mono mode is not
affected. </p>
</div>
</li>
<li>
<h3>Version 0.6.0 released</h3>
<p class="submitdate">4 July, 2009</p>
<div class="description">
<p>Version 0.6.0 has just been released, with many quality improvements, including
better stereo coupling, better handling of transients, and better handling of
highly tonal signals. In addition, packet loss robustness has been improved
through the optional use of independent (intra) frames. CELT now supports a
larger dynamic range, suitable for encoding 24-bit audio (float version only).
There is also a very early VBR implementation.</p>
</div>
</li>
<li>
<h3>Compatibility version 0.5.1.3 released</h3>
<p class="submitdate">12 May, 2009</p>
<div class="description">
<p>This is a bugfix update of the 0.5.1.1
compatability release with several bugfixes backported
into the 0.5.1 compatability branch. As with 0.5.1.1,
this release is not compatible with either 0.5.0 or
earlier, or with 0.5.2 and later. <p>
</div>
</li>
<li>
<h3>Compatibility version 0.5.1.1 released</h3>
<p class="submitdate">22 April, 2009</p>
<div class="description">
<p>This is an update of the previous 0.5.1 prerelease;
as several software and hardware projects have seen
fit to deplot this prerelease version for development
and testing, we've released this new version that
changes the installation namespace from 'celt' to
'celt051' to ease installation and parallel
development with other versions of celt without
conflict. Aside from renaming symbols and install
locations to 'celt051' there are no other changes from
the celt 0.5.1 release. As with other CELT
prereleases, this release is not compatible with
either 0.5.0 or earlier, or with 0.5.2 and later. <p>
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</li>
<li>
<h3>Version 0.5.2 released</h3>
<p class="submitdate">17 February, 2009</p>
<div class="description">
<p>Version 0.5.2 has just been released with a few fixes over 0.5.1. On top of that,
the pitch prediction was both improved and simplified. The other main change is a
new bit allocation algorithm with better rounding and fine energy allocation.</p>
</div>
</li>
<li>
<h3>Version 0.5.1 released</h3>
<p class="submitdate">17 December, 2008</p>
<div class="description">
<p>Version 0.5.1 is out. This release fixes a number of issues with 0.5.0. Several cases
where the encoder could fail have been fixed, including one that could cause memory
corruption (and possibly a segfault). In addition, the VQ search has been improved,
which results in a small CPU reduction, while fixing some quality problems with low
frequency tones. Other than that, there should be no significant quality changes.</p>
</div>
</li>
<li>
<h3>Version 0.5.0 released</h3>
<p class="submitdate">10 October, 2008</p>
<div class="description">
<p>Version 0.5.0 is out. This release includes simplifications to the bit allocation code
and includes a new low-complexity mode that can be enabled (without breaking compatibility)
on the encoder side. There are several other optimisations and bug fixes included. The API
has also been slightly modified, so code using CELT will have to be updated (minor).</p>
</div>
</li>
<li>
<h3>Version 0.4.0 released</h3>
<p class="submitdate">26 July, 2008</p>
<div class="description">
<p>Version 0.4.0 is out. This release should greatly improve the handling of transients and reduce
the amount of pre-echo, especially for larger frame sizes. There is now support for frame sizes up
to 512 samples for those who don't have extreme delay requirements. The release also brings improved
tuning for stereo and a variety of frame sizes and higher bit-rates. The API has been changed
slightly to remove the <i>overlap</i> parameter, which is now automatically selected based on the
frame size.</p>
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</li>
<li>
<h3>Version 0.3.2 released</h3>
<p class="submitdate">16 May, 2008</p>
<div class="description">
<p>Version 0.3.2 is out. This consists mainly of quality tuning. We've also completed some listening tests based on that version for the <a href="/comparison/">Comparison</a> page.</p>
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</li>
<li>
<h3>Version 0.3.1 released</h3>
<p class="submitdate">26 April, 2008</p>
<div class="description">
<p>Version 0.3.1 is now released. CELT is now a lot faster and can run in real-time on a PC with less than 10% CPU.</p>
</div>
</li>
<li>
<h3>Domain is up</h3>
<p class="submitdate">18 March, 2008</p>
<div class="description">
<p>Just registered celt-codec.com and celt-codec.org for this project. Now working
on the website</p>
</div>
</li>
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