<div dir="ltr"> <div class="gmail_extra"> <div class="gmail_quote">On Sun, Jun 1, 2014 at 5:14 AM, Sebastian Dröge <<a href="mailto:sebastian@centricular.com" target="_blank">sebastian@centricular.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=""><div class="h5">On Sa, 2014-05-31 at 17:51 -0300, Tiago Katcipis wrote: > Hi, > > Sorry if I'm asking something stupid, but i was unable to find anything > about this subject on the docs (about caps it always explaining how the > different negotiation scenarios happens, but not this). > > I want to use a application specific caps on a plugin that I'm writing, it > will basically receive audio and produce a proprietary binary format > (neither audio or video). > > So i create my caps like: > > static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", > GST_PAD_SRC, > GST_PAD_ALWAYS, > GST_STATIC_CAPS ("application/vnd.mydata+octet-stream") > ); > > And i run a pipeline with fakesink or filesink (both accepts "any" caps), > but it fails to link it: > > WARNING: erroneous pipeline: could not link myplugin to fakesink0 > > if i just change the caps to: > > static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", > GST_PAD_SRC, > GST_PAD_ALWAYS, > GST_STATIC_CAPS ("audio/x-raw") > ); > > It works perfectly fine. It makes no sense to me since fakesink/filesink > should accept any type of data. > > Is Gstreamer limited to a fixed set of caps ? I cant define a new > application specific caps ? </div></div>GStreamer does not limits itself to a fixed set of caps. The only reason why custom caps might not be accepted by another element is if that element does not accept these custom caps. </blockquote><div> <div class="" id=":222" tabindex="-1"><div id=":2kw" class="" tabindex="0"><img class="" src="https://mail.google.com/mail/u/0/images/cleardot.gif"></div> </div><div>I tested a little further and i got this: gst-launch-1.0 audiotestsrc ! appspecificcaps ! fakesink WARNING: erroneous pipeline: could not link appspecificcaps0 to fakesink0 gst-launch-1.0 fakesrc ! appspecificcaps ! fakesink </div><div>works fine. </div>It seems that changing the source causes the problem, which seems odd since a intersection between the source pad and the sink pad is only required (and automatically done/checked) on plugins that inherits from GstBaseTransform. But my plugin inherits from GstElement (actually i have an empty template that reproduces the problem). </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> But you say you directly link your element to a fakesink? That should work just fine, and if it doesn't please provide a debug log with GST_DEBUG=6. It will contain the reason why it doesn't work. If changing the caps to audio/x-raw makes it work in exactly the same pipeline, then this suggests that you have an element between your element and fakesink that only supports raw audio. </blockquote><div> I attached the log. From what i can see it seems that a intersection between the sink pad and the src pad of my element is being made, is this the default behaviour ? </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> -- Sebastian Dröge, Centricular Ltd - <a href="http://www.centricular.com" target="_blank">http://www.centricular.com</a> Expertise, Straight from the Source _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div> </div></div>