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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 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 class="moz-txt-link-freetext" href="https://webchat.freenode.net/">https://webchat.freenode.net/</a><br>
<br>
<div class="moz-cite-prefix">On 16/11/2015 17:37, Honeyager, Kevin
S. wrote:<br>
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<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>
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<p class="MsoNormal">Kevin<o:p></o:p></p>
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<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>
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