<div>I think you can't simply put any mimetype in the caps , it must be some valid mimetype . </div> <div> </div> <div>Please go through this link <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/section-types-definitions.html">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/section-types-definitions.html</a> </div> <div class="gmail_quote">On Tue, May 18, 2010 at 4:01 PM, Hunterwood <<a href="mailto:markus.jagerskogh@imentum.se">markus.jagerskogh@imentum.se</a>> wrote: <blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote"> Hi, I have tried several different non-existing types: audio/x-test, audio/xyz, audio/x-xyz, audio/x-qwertyuiop, audio/x-test, ... Since my encoder is passing data to my decoder, I thought that the only imortant thing was that they have the same caps to make it work (when I'm finished, I want them to use a currently non-existing type), but it doesn't work. gst-inspect shows the same type for the source of the encoder and the sink of the decoder, but when trying with gst-launch, it doesn't work: C:\gstreamer\bin>gst-launch-0.10.exe audiotestsrc ! gtestenc ! gtestdec ! audioresample ! autoaudiosink Setting pipeline to PAUSED ... Pipeline is PREROLLING ... ERROR: from element /GstPipeline:pipeline0/GstAudioTestSrc:audiotestsrc0: Internal data flow error. Additional debug info: ..\Source\gstreamer\libs\gst\base\gstbasesrc.c(2378): gst_base_src_loop (): /GstPipeline:pipeline0/GstAudioTestSrc:audiotestsrc0: streaming task paused, reason not-negotiated (-4) ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ... C:\gstreamer\bin> Since I couldn't make it work with non-existing types i tried several different existing types, but the only types that work are ANY and audio/x-raw-int: C:\gstreamer\bin>gst-launch-0.10.exe audiotestsrc ! gtestenc ! gtestdec ! audioresample ! autoaudiosink Setting pipeline to PAUSED ... Pipeline is PREROLLING ... Pipeline is PREROLLED ... Setting pipeline to PLAYING ... New clock: GstAudioSinkClock ^C C:\gstreamer\bin> To isolate the problem with the caps, the code just passes on the incomming buffer (just as the gst-template, which I used as base), and the interresting parts of the encoder looks like this (I have omited gst_gtestenc_class_init and parts of gst_gtestenc_base_init bellow): static GstStaticPadTemplate gtest_enc_sink_factory = GST_STATIC_PAD_TEMPLATE <div class="im">("sink", GST_PAD_SINK, GST_PAD_ALWAYS, </div> GST_STATIC_CAPS ("audio/x-raw-int, " "rate = (int) { 48000 }, " "channels = (int) { 1 }, " "endianness = (int) BYTE_ORDER, " "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) True") ); <div class="im"> static GstStaticPadTemplate gtest_enc_src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, </div> GST_STATIC_CAPS ("audio/x-test") ); GST_BOILERPLATE (Gstgtestenc, gst_gtestenc, GstElement, GST_TYPE_ELEMENT); static void gst_gtestenc_base_init (gpointer gclass) { GstElementClass *element_class = GST_ELEMENT_CLASS (gclass); // ... gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&amp;gtest_enc_src_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&amp;gtest_enc_sink_factory)); } static void gst_gtestenc_init (Gstgtestenc * filter, GstgtestencClass * gclass) { filter->sinkpad = gst_pad_new_from_static_template (&amp;gtest_enc_sink_factory, "sink"); gst_pad_set_chain_function (filter->sinkpad, GST_DEBUG_FUNCPTR(gst_gtestenc_chain)); filter->srcpad = gst_pad_new_from_static_template (&amp;gtest_enc_src_factory, "src"); gst_element_add_pad (GST_ELEMENT (filter), filter->sinkpad); gst_element_add_pad (GST_ELEMENT (filter), filter->srcpad); gst_pad_use_fixed_caps (filter->sinkpad); gst_pad_use_fixed_caps (filter->srcpad); } static GstFlowReturn gst_gtestenc_chain (GstPad * pad, GstBuffer * buf) { Gstgtestenc *filter; filter = GST_GtestENC (GST_OBJECT_PARENT (pad)); /* just push out the incoming buffer without touching it */ return gst_pad_push (filter->srcpad, buf); } The code in the decoder is basicly the same - pass on the incomming data. The main difference at the moment is the caps definitions: <div class="im"> static GstStaticPadTemplate gtest_dec_sink_factory = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, </div> GST_STATIC_CAPS ("audio/x-test") ); static GstStaticPadTemplate gtest_dec_src_factory = GST_STATIC_PAD_TEMPLATE <div class="im">("src", GST_PAD_SRC, GST_PAD_ALWAYS, </div> GST_STATIC_CAPS ("audio/x-raw-int, " "rate = (int) { 48000 }, " "channels = (int) { 1 }, " "endianness = (int) BYTE_ORDER, " "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) True") ); What am I doing wrong? Why is it working with audio/x-raw-int, but not with audio/x-test? Regards, Markus -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Caps-problem-when-writing-encoder-decoder-tp2219436p2221067.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Caps-problem-when-writing-encoder-decoder-tp2219436p2221067.html</a> <div> <div></div> <div class="h5">Sent from the GStreamer-devel mailing list archive at Nabble.com. ------------------------------------------------------------------------------ _______________________________________________ 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> </div></div></blockquote></div> -- Regards, Sudarshan Bisht