<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
Also, check out the "Bitrate Scalability" demo at
<a class="moz-txt-link-abbreviated" href="http://www.opus-codec.org/examples/">www.opus-codec.org/examples/</a> to get a feel of what happens at what
bitrate.<br>
E.g. for your 16kbps you should expect a mono output, low-passed at
6KHz...<br>
<br>
<div class="moz-cite-prefix">On 25/11/2015 18:49, Orestes Zoupanos
wrote:<br>
</div>
<blockquote
cite="mid:BLU436-SMTP21DBB865F2389AB97DFC6AA5050@phx.gbl"
type="cite">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
Hey Kevin!<br>
<br>
Once you start dropping under (I think) 32kbps, the codec
naturally starts losing stereo separation for the benefit of
quality.<br>
If you really want perfect stereo at 16kbps CBR (this is
horrifically low in my opinion) you might be better off splitting
the audio and encoding each part at 8kbps CBR.<br>
Or, there may be a magic "enforce 100% stereo" one could pass?
(doesn't look like it at
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://mf4.xiph.org/jenkins/view/opus/job/opus-tools/ws/man/opusenc.html">https://mf4.xiph.org/jenkins/view/opus/job/opus-tools/ws/man/opusenc.html</a>)<br>
<br>
You can always ask stuff at the #opus channel at <a
moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://webchat.freenode.net/"><a class="moz-txt-link-freetext" href="https://webchat.freenode.net/">https://webchat.freenode.net/</a></a><br>
<br>
<div class="moz-cite-prefix">On 16/11/2015 17:37, Honeyager, Kevin
S. wrote:<br>
</div>
<blockquote
cite="mid:9bb1bf75b91549dba9aa2ea66bc3ecba@MBX256.adm.swri.edu"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve been using Opus on an STM32 M4
platform for speech coding in mono mode. I thought I’d try
stereo for grins to see if I can handle the CPU load, and
I’m getting a return code of -1 from opus_decode_float
(using CBR and 40ms frames).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I decided to try the opusenc and opusdec
tools to just see how the command line apps would behave. I
am getting decoded audio, but I am losing the stereo
separation. My test file has speech obtained with a Tascam
Recorder, and I spoke directly into each mic individually.
I can clearly hear the stereo separation in the recorded
audio. I do not hear any stereo separation once I encode
from wav and decode back to wav. My encoding command
line is “opusenc --hard-cbr --bitrate 16.000 --complexity 10
--framesize 20 stereo_voice.wav temp.opus”. My decoding
script is: “opusdec --force-wav temp.opus decode.wav”.
Opusenc reports that my encoded file is 2 channels (coupled)
and opusdec reports that my file is 2 channels. Can someone
tell me how to retain my stereo separation? If I can’t get
stereo separation from the codec, there’s no point in me
investigating the error return in my ARM application.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<table class="MsoNormalTable" style="border-collapse:collapse"
border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr style="height:14.1pt">
<td rowspan="3" style="width:.95in;padding:0in 5.4pt 0in
5.4pt;height:14.1pt" valign="top" width="91">
<p class="MsoNormal">Kevin<o:p></o:p></p>
</td>
<td style="width:157.5pt;padding:0in 5.4pt 0in
5.4pt;height:14.1pt" valign="top" width="210">
<p class="MsoNormal"><b><span
style="font-size:9.0pt;color:#0033CC"><o:p> </o:p></span></b></p>
</td>
</tr>
<tr style="height:14.1pt">
<td style="width:157.5pt;padding:0in 5.4pt 0in
5.4pt;height:14.1pt" valign="top" width="210">
<p class="MsoNormal"><b><span
style="font-size:9.0pt;color:#0033CC"><o:p> </o:p></span></b></p>
</td>
</tr>
<tr style="height:14.1pt">
<td style="width:157.5pt;padding:0in 5.4pt 0in
5.4pt;height:14.1pt" valign="top" width="210">
<p class="MsoNormal"><span style="font-size:9.0pt"><o:p> </o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
opus mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:opus@xiph.org">opus@xiph.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://lists.xiph.org/mailman/listinfo/opus">http://lists.xiph.org/mailman/listinfo/opus</a>
</pre>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
opus mailing list
<a class="moz-txt-link-abbreviated" href="mailto:opus@xiph.org">opus@xiph.org</a>
<a class="moz-txt-link-freetext" href="http://lists.xiph.org/mailman/listinfo/opus">http://lists.xiph.org/mailman/listinfo/opus</a>
</pre>
</blockquote>
<br>
</body>
</html>