<div>Run oprofile to get detail breakup of the CPU consumption by each element.</div> <div>Even I had similar high CPU load issues with gstreamer. Oprofile helped a lot. </div> <div> </div> <div>Regards,</div> <div>Viraj </div> <div class="gmail_quote">2009/12/17 Zhao, Halley <<a href="mailto:halley.zhao@intel.com">halley.zhao@intel.com</a>> <blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">Finally, I found out pulseaudio play a lot in the audio pipeline, if I access alsasrc, hw:0 directly, it could make %cpu half. Then I tried flac instead of vorbis, %CPU is decreased another half. -----Original Message----- From: Zhao, Halley [mailto:<a href="mailto:halley.zhao@intel.com">halley.zhao@intel.com</a>] Sent: 2009年12月15日 9:36 To: 'Stefan Kost'; 'Discussion of the development of GStreamer' Subject: Re: [gst-devel] How to decrease CPU consumation for audio recording? Thanks for your suggestion. But further information shows vorbisenc doesn't matter much in the pipeline. Either fakesink or vorbisenc will consume 50+% CPU, but arecord only 4% CPU. I will use C programming to identify it is not caused by gst-launch. Maybe buffer size matter here. === audio only + fakesink gst-launch alsasrc ! audio/x-raw-int, rate=8000 ! queue ! fakesink gst-launch 51%CPU, pulseaudio 13%CPU === save audio to ogg/vorbis gst-launch alsasrc ! audio/x-raw-int, rate=8000, width=16, depth=16, channel=1 ! queue ! audioconvert ! vorbisenc ! oggmux ! filesink location=test-audio.ogg gst-launch 57%CPU, pulseaudio 13%CPU === arecord and drop data arecord >/dev/null Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono arecord 4.3%, pulseaudio 2.2% === arecord save to file arecord >test.wav Recording WAVE 'stdin' : Unsigned 8 bit, Rate 8000 Hz, Mono arecord 4.4%, pulseaudio 2.3% -----Original Message----- From: Stefan Kost [mailto:<a href="mailto:ensonic@hora-obscura.de">ensonic@hora-obscura.de</a>] Sent: 2009年12月15日 6:05 To: Discussion of the development of GStreamer Cc: Zhao, Halley Subject: Re: [gst-devel] How to decrease CPU consumation for audio recording? Am 14.12.2009 08:53, schrieb Zhao, Halley: > I have a simple audio recording pipeline as below. To my surprise it > consumes CPU as high as a 640x480 video recording. Could it be optimized > to use CPU less? > > gst-launch alsasrc ! audio/x-raw-int, rate=8000, width=16, depth=16, > channel=1 ! queue ! audioconvert ! vorbisenc ! oggmux ! filesink > location=test-audio.ogg 1.) optimize vorbis 2.) add orc opimizations to audioconvert (vorbis-enc wants float input) 3.) we need some optimizations for such pipleines so that audioencoder and audiosrc can negotiate a (max-)buffer size. the encoder would then provide pad_alloc (resuable buffers). this needs same work on audioconvert too Stefan > > > > on a netbook with ATOM 1.6GHZ, ~90 %CPU. > > > > Thanks in advance. > > > > > > *ZHAO, Halley (Aihua)* > > Email: <a href="mailto:halley.zhao@intel.com">halley.zhao@intel.com</a> <BLOCKED::mailto:<a href="mailto:aihua.zhao@intel.com">aihua.zhao@intel.com</a>> > > Tel: +86(21)61166476 > > iNet: 8821-6476 > > SSG/OTC/Moblin 3W038 Pole: F4 > > > > > > ------------------------------------------------------------------------------ > Return on Information: > Google Enterprise Search pays you back > Get the facts. > <a href="http://p.sf.net/sfu/google-dev2dev" target="_blank">http://p.sf.net/sfu/google-dev2dev</a> > > > > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> > <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> ------------------------------------------------------------------------------ Return on Information: Google Enterprise Search pays you back Get the facts. <a href="http://p.sf.net/sfu/google-dev2dev" target="_blank">http://p.sf.net/sfu/google-dev2dev</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers <a href="http://p.sf.net/sfu/verizon-dev2dev" target="_blank">http://p.sf.net/sfu/verizon-dev2dev</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div>