<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:st="" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=gb2312"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="PersonName"/>  <style>  </style> </head> <body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'> <div class=Section1 style='layout-grid:15.6pt'> Hi<o:p></o:p> <o:p> </o:p> Currently, I will create two src pads, one is ALWAYS, and the other is SOMETIMES, but when both of the pads are created, it will hang on _chain() when calling gst_pad_push for the first src pad, seems something wrong with preproll. But it works well when the SOMETIMES pad is not created.<o:p></o:p> <o:p> </o:p> Could anybody here give me some hint?<o:p></o:p> <o:p> </o:p> Thanks in advance.<o:p></o:p> <o:p> </o:p> <o:p> </o:p> Following is some of the code:<o:p></o:p> <o:p> </o:p> static GstStaticPadTemplate src00_factory = GST_STATIC_PAD_TEMPLATE ("src_00",<o:p></o:p>         GST_PAD_SRC,<o:p></o:p>         GST_PAD_ALWAYS,<o:p></o:p>         GST_STATIC_CAPS ("video/mpeg;" <o:p></o:p>         "video/x-h264")<o:p></o:p>         );<o:p></o:p> <o:p> </o:p> static GstStaticPadTemplate src01_factory = GST_STATIC_PAD_TEMPLATE ("src_01",<o:p></o:p>         GST_PAD_SRC,<o:p></o:p>         GST_PAD_SOMETIMES,<o:p></o:p>         GST_STATIC_CAPS ("video/x-raw-yuv")<o:p></o:p>         );<o:p></o:p> ………<o:p></o:p> srcpad_00 = gst_pad_new_from_static_template (&src00_factory, "src_00");<o:p></o:p> gst_element_add_pad (GST_ELEMENT(filter), srcpad_00);<o:p></o:p> <o:p> </o:p> gst_pad_set_caps (srcpad_00, outcaps00);<o:p></o:p> <o:p> </o:p> if (create_sometime) {<o:p></o:p>     srcpad_01 = gst_pad_new_from_static_template (&src01_factory, "src_01");<o:p></o:p> gst_element_add_pad (GST_ELEMENT(filter), srcpad_01);<o:p></o:p> gst_pad_set_caps (srcpad_01, outcaps01);<o:p></o:p> }<o:p></o:p> …….<o:p></o:p> <o:p> </o:p> _chain()<o:p></o:p> {<o:p></o:p> ………<o:p></o:p> <o:p> </o:p> ret = gst_pad_push (mixvideoenc->srcpad_00, out_buf_00);    //if will hang here, if both of the src pad is created.<o:p></o:p> <o:p> </o:p> if (srcpad_01 && create_sometim) {<o:p></o:p>      ret = gst_pad_push (mixvideoenc->srcpad_01, out_buf_01);    <o:p></o:p> }<o:p></o:p> ………<o:p></o:p> }<o:p></o:p> <o:p> </o:p> thanks,<o:p></o:p> Weian<o:p></o:p> <o:p> </o:p> -----Original Message----- From: Michael Smith [mailto:msmith@xiph.org] Sent: 2009年10月14日 13:42 To: <st1:PersonName w:st="on">Discussion of the development of GStreamer</st1:PersonName> Subject: Re: [gst-devel] Question on the element who will have two pad types <o:p> </o:p> ><o:p> </o:p> > No way to give advice about that - we don't know anything about your<o:p></o:p> > element. But there's nothing intrinsically difficult about what you've<o:p></o:p> > described - just push data on the pads you have!<o:p></o:p> ><o:p> </o:p> > I mean do we need two _chain functions or we can push data to the 2 pads in the same _chain function (the data push to the 2 pads is different).<o:p></o:p> <o:p> </o:p> No - what you've described is just like any normal demuxer. You<o:p></o:p> wouldn't have multiple chain functions, since you don't have multiple<o:p></o:p> sinkpads.<o:p></o:p> <o:p> </o:p> Mike<o:p></o:p> <o:p> </o:p> ------------------------------------------------------------------------------<o:p></o:p> Come build with us! The BlackBerry(R) Developer Conference in SF, CA<o:p></o:p> is the only developer event you need to attend this year. Jumpstart your<o:p></o:p> developing skills, take BlackBerry mobile applications to market and stay <o:p></o:p> ahead of the curve. Join us from November 9 - 12, 2009. Register now!<o:p></o:p> http://p.sf.net/sfu/devconference<o:p></o:p> _______________________________________________<o:p></o:p> gstreamer-devel mailing list<o:p></o:p> gstreamer-devel@lists.sourceforge.net<o:p></o:p> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel<o:p></o:p> </div> </body> </html>