<div dir="ltr"><div dir="ltr">I'm not sure if you've had a reply yet, but have you seen <a href="https://mf4.xiph.org/jenkins/view/opus/job/opus/ws/doc/html/group__opus__multistream.html#details">https://mf4.xiph.org/jenkins/view/opus/job/opus/ws/doc/html/group__opus__multistream.html#details</a> ? That gives the basic details of multistream and links to the important references. For pure six mics, likely isolated, it sounds like coupling would probably be counterproductive, and each stream might be best as monaural, so seven separate streams interleaved.</div><div dir="ltr"><br></div><div>The main reasoning for multi-stream over multi-channel is flexibility. There's no inherent notion of coupling or grouping of streams the way there is channels; many separate simultaneous recordings can be multiplexed together in one stream and separated to different receivers at the end. If you don't need any of that functionality, you can just treat streams as channels, and there won't be any delay or bitrate penalty.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 22, 2019 at 5:07 AM zhuangweiji <<a href="mailto:zhuangweiji@foxmail.com">zhuangweiji@foxmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><p style="box-sizing:border-box;margin-bottom:16px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin-top:0px">Hello everyone,</p><p style="box-sizing:border-box;margin-bottom:16px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin-top:0px">I tried to compress audio with opus-1.3.1/src/opus_demo.c recently, which works fine on mono and stereo data .<br style="box-sizing:border-box">Now I want to compress interleaved 7 channels pcm/wav ( recorded by Microphone array :6mic+ 1reference signal ) with opus, But I have not found an interface that compress multi-channels pcm/wav.</p><p style="box-sizing:border-box;margin-bottom:16px;margin-top:0px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol"">1、Is there a multi-channel compression interface can be used in my case?<br style="box-sizing:border-box">If so, where is it, and how can I call it? is there a demo?<br style="box-sizing:border-box">If it doesn't exist, how can I modify it to make it support interleaved multi-channel data?</p><p style="box-sizing:border-box;margin-top:0px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin-bottom:0px">2、In addition, I saw that there is a multi-stream interface. It seems to be not a multi-channel. What is the difference between multi-stream and multi-channel?</p><p style="box-sizing:border-box;margin-top:0px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin-bottom:0px"><br></p><p style="box-sizing:border-box;margin-top:0px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin-bottom:0px">Thanks in advance.</p><p style="box-sizing:border-box;margin-top:0px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin-bottom:0px"><br></p><p style="box-sizing:border-box;margin-top:0px;color:rgb(36,41,46);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin-bottom:0px">Weiji Zhuang</p>_______________________________________________<br>
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