<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> please forget my last question, sorry :-) Ben Benoit Fouet wrote: <blockquote cite="mid44576A23.5080005@purplelabs.com" type="cite"> <pre wrap="">Thank you ! I don't really think I would need a queue before the video renderer, unless it is mandatory, so that I can have as less threads as possible to avoid context switch as much as I can. I wonder one thing (again :-) ): tee elements can have two different frame rates on their source pads ? i guess so, but it's to be sure... Thanks again, Ben Edgard Lima wrote: </pre> <blockquote type="cite"> <pre wrap=""> If you want something like: videosrc ! tee tee0. ! queue ! videorendersink tee0. ! queue ! videoencsink we could make videosrc ! tee ! queue ! videorendersink tee0. ! queue ! videoreate ! video/x-raw-yuv, framerate=\(fraction\)15/1 ! videoencsink Or else if your "videoencsink" has a rate property BR, Edgard Lima - alima <a class="moz-txt-link-abbreviated" href="mailto:edgard.lima@indt.org.br">edgard.lima@indt.org.br</a> ext Benoit Fouet wrote: </pre> <blockquote type="cite"> <pre wrap=""> Wim Taymans wrote: </pre> <blockquote type="cite"> <pre wrap="">On Thu, 2006-04-27 at 18:39 +0200, Benoit Fouet wrote: </pre> <blockquote type="cite"> <pre wrap="">Hi, I've read Gstreamer documentation (i.e. Application Development Manual and Plugin Writer's Guide) and one point remains obscure to me. I can't figure out how data is synchronized over the pipeline. e.g. when having a pipeline as simple as an audio file source, a decoder and an audio plugin, the source is able to provide data much more quickly than the decoder can work, itself more quickly than the audio sink is able to flush data on driver. though, my question is: what is the event that allows an element to provide data over its source pad ? is it that gst_pad_push is called in the same thread, and is by the way blocking the upstream element, or are there other synchronization methods ? </pre> </blockquote> <pre wrap=""> Yep, pad_push() eventually blocks somewhere downstream, either in a sink that does synchronisation or another element that rate controls in one way or another (queue, based on buffer size, some network element). All elements in a pipeline share the same clock normally, a typical sink waits for the clock to reach the propor time corresponding to the buffer timestamps before rendering a buffer. As soon as the buffer is rendered (or scheduled for rendering in the case of audio) pad_push() returns and upstream elements can produce new data. Hope that explains, Wim </pre> </blockquote> <pre wrap="">It does explain, thanks :) I have a related second question: in case an element has multiple source pads (let's say 2 for instance), is there a way to have one of them blocked and the other one allowed to produce new data ? e.g. if a video source element provides data to both a renderer/display (rather quick) and an encoder (slower), is it possible that the display element have access to more frames than the encoder ? in other words, let's say you can produce 30 frames per second and you encode at 15 but you want to display 30. do the downstream elements have to manage themselves to drop frames they don't need ? Regards, Ben </pre> <blockquote type="cite"> <pre wrap=""> </pre> <blockquote type="cite"> <pre wrap="">Thanks, Ben ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo <a class="moz-txt-link-freetext" href="http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642">http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642</a> _______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a class="moz-txt-link-freetext" href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </pre> </blockquote> </blockquote> </blockquote> <pre wrap=""> ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo <a class="moz-txt-link-freetext" href="http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642">http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642</a> _______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a class="moz-txt-link-freetext" href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </pre> </blockquote> <pre wrap=""> ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo <a class="moz-txt-link-freetext" href="http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642">http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642</a> _______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a class="moz-txt-link-freetext" href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </pre> </blockquote> </body> </html>