Thank you for reply Tim. why I have written because aacparse plugin is not giving profile.It is only giving rate,channels,stream-format,mpegversion and framed=true. I put the profile/level into the caps. But when I query the caps I am getting CAPS which are set in GST_STATIC_PAD_TEMPLATE.(I am getting ANY). I am setting the caps in the chain function only.Is it correct way of doing? Do I have to use gst_set_src_caps()?I am not using gst_set_src_caps() in my plugin. Also can u please tell me about gst_set_src_caps() function why it should be used? Below is the code what I am using(template and chain function which parse only header information and push the buffer at it is). static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS_ANY ); and, static GstFlowReturn gst_MyParser_chain (GstPad * pad, GstBuffer * buf) { Myfilter *filter; filter = GST_MYPARSER (GST_OBJECT_PARENT (pad)); if (filter->silent == FALSE) g_print ("I'm plugged, therefore I'm in.\n"); GstCaps *caps=NULL; gint8 profile; GstBuffer * tempBuffer = buf; profile = ( tempBuffer->data[2] & 0xc0 ) >> 6; switch(profile) { case AAC_MAIN_PROFILE: caps = gst_caps_new_simple("audio/mpeg", "profile",G_TYPE_STRING,"HE-AAC", NULL); break; case AAC_LOW_COMPLEXITY_PROFILE: caps = gst_caps_new_simple( "audio/mpeg", "profile",G_TYPE_STRING,"LC", NULL); break; case AAC_SCALABLE_SAMPLING_RATE_PROFILE: break; case AAC_RESERVED: printf("\nAAC_RESERVED\n"); break; } //Sets the capabilities of this source pad. if (FALSE == gst_pad_set_caps(filter->srcpad, caps)) { return GST_FLOW_ERROR; } if ( caps != NULL) { gst_caps_unref(caps); caps = NULL; } //setting the source pad caps to out buffer gst_buffer_set_caps(buf, GST_PAD_CAPS(filter->srcpad)); /* just push out the incoming buffer without touching it */ return gst_pad_push (filter->srcpad, buf); } I put the profile/level into the caps. But when I query the caps <div class="gmail_quote"> On Mon, Jul 23, 2012 at 7:34 PM, Tim-Philipp Müller <<a href="mailto:t.i.m@zen.co.uk" target="_blank">t.i.m@zen.co.uk</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> On Mon, 2012-07-23 at 19:17 +0530, kalyan chowdary wrote: Hi, In future you might want to consider using an actual subject line that describes your question/problem, so people interested in that area can spot it right away. Mails with empty subject often get ignored or sorted to /dev/null. <div class="im"> > On Fri, Jul 20, 2012 at 8:50 PM, kalyan chowdary > <<a href="mailto:kalyanc007@gmail.com">kalyanc007@gmail.com</a>> wrote: </div><div class="im">> I have written parser kind of plugin(aacparser) in which I > have parsed the header name.And I linked it to the decoder > plugin. </div>Out of curiosity - why have you written another aacparser in addition to the existing aacparse? What does it do that aacparse doesn't do? <div class="im"> > My question is how to get the profile name in gstreamer > application.Based on that I have to link my parser to decoder. > Ex: > filesrc ! parser ! faad ! alsasink > filesrc ! parser ! MyDecoder ! alsasink > </div><div class="im">> If I set it as property in my parser plugin,will I be able to > read it from gstreamer application? </div>You can put the profile/level into the caps, as aacparse does. The application can then either query the caps after the pipeline is prerolled, or it could use g_signal_connect(pipeline, "deep-notify::caps" ...) to get notified of caps changes on pads (this will be called from a streaming thread then usually). If it's just between your element and your application, you could also post a custom element message with the information you want the app to know. It will then get the element message on the GstBus. Cheers -Tim _______________________________________________ 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>