https://wiki.multimedia.cx/index.php?title=Opus&feed=atom&action=historyOpus - Revision history2024-03-29T07:00:02ZRevision history for this page on the wikiMediaWiki 1.39.5https://wiki.multimedia.cx/index.php?title=Opus&diff=14502&oldid=prevR1 at 11:17, 25 March 20132013-03-25T11:17:04Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 04:17, 25 March 2013</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Open standard for low-latency, scalable lossy audio coding based on the speech-oriented [[SILK]] codec and the low-latency [[CELT]] codec. Opus can transition between a linear prediction codec at low bitrates and a transform codec at high bitrates and supports a hybrid mode for a small bitrate range. Opus defaults to a latency that's 1/10th that of earlier music codecs (20ms vs. 200ms), making it possible for use in VoIP, and yet performs better in listening tests.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Open standard for low-latency, scalable lossy audio coding based on the speech-oriented [[SILK]] codec and the low-latency [[CELT]] codec. Opus can transition between a linear prediction codec at low bitrates and a transform codec at high bitrates and supports a hybrid mode for a small bitrate range. Opus defaults to a latency that's 1/10th that of earlier music codecs (20ms vs. 200ms), making it possible for use in VoIP, and yet performs better in listening tests.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Note that Opus does not <del style="font-weight: bold; text-decoration: none;">exceed the performance of </del>[[CELT]] for music at bitrates over 75 kbit (http://www.hydrogenaudio.org/forums/index.php?showtopic=97913&st=0) <del style="font-weight: bold; text-decoration: none;">which </del>means that the unconditional merge of [[CELT]] into <del style="font-weight: bold; text-decoration: none;">OPUS </del>doubled the <del style="font-weight: bold; text-decoration: none;">amount of </del>code <del style="font-weight: bold; text-decoration: none;">to be present, </del>even for applications which do not benefit from the addition.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Note that Opus does not <ins style="font-weight: bold; text-decoration: none;">seem to perform better than </ins>[[CELT]] for music at bitrates over 75 kbit (http://www.hydrogenaudio.org/forums/index.php?showtopic=97913&st=0)<ins style="font-weight: bold; text-decoration: none;">. This </ins>means that the unconditional merge of [[CELT]] into <ins style="font-weight: bold; text-decoration: none;">Opus </ins>doubled the <ins style="font-weight: bold; text-decoration: none;">complexity (both </ins>code <ins style="font-weight: bold; text-decoration: none;">size and CPU usage) </ins>even for applications which do not benefit from the addition.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Links ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Links ==</div></td></tr>
</table>R1https://wiki.multimedia.cx/index.php?title=Opus&diff=14497&oldid=prevR1 at 17:49, 24 March 20132013-03-24T17:49:58Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:49, 24 March 2013</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Open standard for low-latency, scalable lossy audio coding based on the speech-oriented [[SILK]] codec and the low-latency [[CELT]] codec. Opus can transition between a linear prediction codec at low bitrates and a transform codec at high bitrates and supports a hybrid mode for a small bitrate range. Opus defaults to a latency that's 1/10th that of earlier music codecs (20ms vs. 200ms), making it possible for use in VoIP, and yet performs better in listening tests.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Open standard for low-latency, scalable lossy audio coding based on the speech-oriented [[SILK]] codec and the low-latency [[CELT]] codec. Opus can transition between a linear prediction codec at low bitrates and a transform codec at high bitrates and supports a hybrid mode for a small bitrate range. Opus defaults to a latency that's 1/10th that of earlier music codecs (20ms vs. 200ms), making it possible for use in VoIP, and yet performs better in listening tests.</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Note that Opus does not exceed the performance of [[CELT]] for music at bitrates over 75 kbit (http://www.hydrogenaudio.org/forums/index.php?showtopic=97913&st=0) which means that the unconditional merge of [[CELT]] into OPUS doubled the amount of code to be present, even for applications which do not benefit from the addition.</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Links ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Links ==</div></td></tr>
</table>R1https://wiki.multimedia.cx/index.php?title=Opus&diff=14173&oldid=prevFatbag at 18:08, 14 September 20122012-09-14T18:08:07Z<p></p>
<p><b>New page</b></p><div>* Company: [[Xiph]], IETF<br />
* Extension: .opus<br />
* Specification (codec): https://tools.ietf.org/html/rfc6716<br />
* Specification (Ogg encapsulation): https://tools.ietf.org/html/draft-terriberry-oggopus-01<br />
* Reference implementation: http://www.opus-codec.org/downloads/<br />
<br />
Open standard for low-latency, scalable lossy audio coding based on the speech-oriented [[SILK]] codec and the low-latency [[CELT]] codec. Opus can transition between a linear prediction codec at low bitrates and a transform codec at high bitrates and supports a hybrid mode for a small bitrate range. Opus defaults to a latency that's 1/10th that of earlier music codecs (20ms vs. 200ms), making it possible for use in VoIP, and yet performs better in listening tests.<br />
<br />
== Links ==<br />
* http://www.opus-codec.org/<br />
* https://wiki.xiph.org/OpusFAQ<br />
<br />
[[Category:Audio Codecs]]<br />
[[Category:MDCT Audio Codecs]]<br />
[[Category:Vocoders]]<br />
[[Category:Multichannel Audio Codecs]]</div>Fatbag