<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style></style></head><body bgcolor=white lang=ZH-CN link=blue vlink=purple><div class=WordSection1>Thanks Stefan.<o:p></o:p>I made mistake to past the command line, here is the one I use.<o:p></o:p>gst-launch-0.10 v4l2src ! video/x-raw-yuv,width=640,height=480,framerate=15/1 ! tee name=t ! ffmpegcolorspace ! queue ! ximagesink t. ! ffmpegcolorspace ! queue ! theoraenc ! oggmux name=mux ! filesink location=test.ogg alsasrc device="hw:0" ! queue ! audiorate ! audio/x-raw-int,rate=44100 ! audioconvert ! flacenc ! queue ! mux.<o:p></o:p><o:p> </o:p><o:p> </o:p>‘top’ shows one CPU is pretty busy in majority time (up to 97%); in the rest time, 2 CPU usage is balanced. (since my platform is 2 core 4 thread, I’m not sure the load is balanced on 2 core or 1core/2threads).<o:p></o:p>Maybe it is caused by theoraenc is not multi-threaded, I’ll dig more.<o:p></o:p><o:p> </o:p><o:p> </o:p><o:p> </o:p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>From: gstreamer-devel-bounces+halley.zhao=intel.com@lists.freedesktop.org [mailto:gstreamer-devel-bounces+halley.zhao=intel.com@lists.freedesktop.org] On Behalf Of Stefan Sauer Sent: Wednesday, December 14, 2011 7:00 PM To: gstreamer-devel@lists.freedesktop.org Subject: Re: how to make full use of dual core CPU for camera recording?<o:p></o:p></div></div><o:p> </o:p>On 12/14/2011 10:29 AM, Zhao, Halley wrote: <o:p></o:p>Hi Experts:<o:p></o:p> <o:p></o:p>On a dual core platform, my gst command line only use half CPU. How could I improve recording performance by using more CPU?<o:p></o:p>Here is my command line:<o:p></o:p>gst-launch-0.10 v4l2src ! video/x-raw-yuv,width=640,height=480,framerate=15/1 !ffmpegcolorspace ! tee name=t t. ! queue ! oggmux name=mux ! queue ! filesink location=test.ogv alsasrc device=“hw:0” ! queue ! audiorate ! audio/x-raw-int,rate=44100 ! audioconvert ! flacenc ! queue ! mux.<o:p></o:p> This already uses several threads to encode audio and video and write the muxed stream. Imho the "tee name=t t. ! queue" in front of oggmux is unused. Also I don't see any video encoder in your pipeline. Using a multithreaded encoder coudl help to better utilize the available copu cores (especially if the encoder is heavy). Stefan <o:p></o:p> <o:p></o:p>While latest cheese(use camerabin) can utilize more CPU to achieve better performance? What’s the difference?<o:p></o:p>Thanks.<o:p></o:p> <o:p></o:p><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>gstreamer-devel mailing list<o:p></o:p></pre><pre><a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a><o:p></o:p></pre><pre><a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a><o:p></o:p></pre><o:p> </o:p></div></div></body></html>