[gst-devel] Problem linking rtspsrc to any other element
Hanno Jaspers
hanno.jaspers at udo.edu
Sun Nov 21 16:18:15 CET 2010
Hi Bobby,
thank you very much! It works like a charm ;)
> Hi,
>
> Applications must listen "pad-added" signal fired from rtspsrc and link
> element in callback function.
>
> Here is an example for reference
>
> static void on_pad_added (GstElement *element, GstPad *pad, void *data)
> {
> GstElement *rtpjpeg = GST_ELEMENT (data);
> GstPad *sinkpad;
>
> sinkpad = gst_element_get_pad (rtpjpeg, "sink");
> gst_pad_link (pad, sinkpad);
> gst_object_unref (sinkpad);
> }
>
> int main (int argc, char *argv[])
> {
> GstElement *rtspsrc = gst_element_factory_make("rtspsrc", NULL);
> GstElement *rtpjpeg = gst_element_factory_make("rtpjpegdepay", NULL);
> // creats some other elements
> // adds elements to pipeline
> // links elements except rtspsrc
> g_signal_connect (rtspsrc , "pad-added", G_CALLBACK (on_pad_added),
> rtpjpeg);
> }
>
> ? 2010/11/21 ?? 12:55, Hanno Jaspers ??:
>> Hi everyone,
>>
>> I try to receive the rtsp stream (a MJPEG stream), sent from an Elphel
>> camera. I get no problems when using vlc or the gst-launch tool. The
>> correct pipeline for gst-launch is: gst-launch rtspsrc
>> location="rtsp://192.168.1.9:554" ! rtpjpegdepay ! jpegdec ! xvimagesink
>>
>> I tried to embed this pipeline in my own application, but somehow, I
>> can't link the rtspsrc to another element. I tried to link it to an
>> rtpjpegdepay element, a queue element, even a fakesink, but nothing
>> works. My code looks sth like this:
>>
>> gst_init (&argc,&argv);
>> GMainLoop *loop = g_main_loop_new(NULL, FALSE);
>>
>> GstElement *pipeline = gst_pipeline_new ("Windows Overlay Test");
>>
>> GstElement *rtspsrc = gst_element_factory_make("rtspsrc", NULL);
>> GstElement *rtpjpeg = gst_element_factory_make("rtpjpegdepay", NULL);
>> GstElement *jpegdec = gst_element_factory_make("jpegdec", NULL);
>> GstElement *fakesink = gst_element_factory_make("fakesink", NULL);
>>
>> if (!(rtspsrc&& rtpjpeg&& jpegdec&& fakesink&& queue1&& queue2&&
>> queue3)) {
>> qCritical()<< "Elements could not be created!!!";
>> exit(-1);
>> }
>>
>> g_object_set(G_OBJECT(rtspsrc), "location", "rtsp://192.168.1.9:554",
>> NULL);
>> g_object_set(G_OBJECT(fakesink), "dump", true, NULL);
>>
>> gst_bin_add_many (GST_BIN (pipeline), rtspsrc, rtpjpeg, jpegdec,
>> fakesink, NULL);
>> if (!gst_element_link(rtspsrc, fakesink)) {
>> qCritical()<< "RTSPSRC could not be linked!!!";
>> exit(-1);
>> }
>>
>> The "gst_element_link(rtspsrc, fakesink)" always returns false. Here's
>> the interesting part of the debug output (GST_DEBUG=4):
>> 0:00:00.457158021 6075 0x1195730 DEBUG GST_PARENTAGE
>> gstbin.c:1152:gst_bin_add_func:<Windows Overlay Test> added element
>> "fakesink0"
>> 0:00:00.457173107 6075 0x1195730 INFO GST_ELEMENT_PADS
>> gstutils.c:1614:gst_element_link_pads_full: trying to link element
>> rtspsrc0:(any) to element fakesink0:(any)
>> 0:00:00.457184491 6075 0x1195730 DEBUG GST_ELEMENT_PADS
>> gstutils.c:1755:gst_element_link_pads_full: trying dest pad
>> fakesink0:sink
>> 0:00:00.457193920 6075 0x1195730 DEBUG GST_ELEMENT_PADS
>> gstutils.c:1115:gst_element_get_compatible_pad: finding pad in rtspsrc0
>> compatible with fakesink0:sink
>> 0:00:00.457204536 6075 0x1195730 DEBUG GST_ELEMENT_PADS
>> gstutils.c:1200:gst_element_get_compatible_pad:<rtspsrc0> Could not
>> find
>> a compatible unlinked always pad to link to fakesink0:sink, now checking
>> request pads
>> 0:00:00.457485856 6075 0x1195730 DEBUG GST_CAPS
>> gstpad.c:2274:gst_pad_get_caps_reffed:<fakesink0:sink> get pad caps
>> 0:00:00.457495564 6075 0x1195730 DEBUG GST_CAPS
>> gstpad.c:2184:gst_pad_get_caps_unlocked:<fakesink0:sink> get pad caps
>> 0:00:00.457504084 6075 0x1195730 DEBUG GST_CAPS
>> gstpad.c:2188:gst_pad_get_caps_unlocked:<fakesink0:sink> dispatching to
>> pad getcaps function
>> 0:00:00.457518681 6075 0x1195730 DEBUG GST_CAPS
>> gstpad.c:2201:gst_pad_get_caps_unlocked:<fakesink0:sink> pad getcaps
>> returned ANY
>> 0:00:00.457546268 6075 0x1195730 DEBUG GST_ELEMENT_PADS
>> gstutils.c:889:gst_element_get_compatible_pad_template: Looking for a
>> suitable pad template in rtspsrc0 out of 1 templates...
>> 0:00:00.457557513 6075 0x1195730 DEBUG GST_CAPS
>> gstutils.c:905:gst_element_get_compatible_pad_template: compatible
>> direction: found src pad template "stream%d"
>> 0:00:00.457566313 6075 0x1195730 DEBUG GST_CAPS
>> gstutils.c:908:gst_element_get_compatible_pad_template: intersecting ANY
>> 0:00:00.457575462 6075 0x1195730 DEBUG GST_CAPS
>> gstutils.c:910:gst_element_get_compatible_pad_template: ..and
>> application/x-rtp; application/x-rdt
>> 0:00:00.457585659 6075 0x1195730 DEBUG GST_CAPS
>> gstutils.c:916:gst_element_get_compatible_pad_template: caps are
>> compatible
>> 0:00:00.457593830 6075 0x1195730 DEBUG GST_ELEMENT_PADS
>> gstutils.c:928:gst_element_get_compatible_pad_template: Returning new
>> pad template 0x1556bb0
>> 0:00:00.457602770 6075 0x1195730 INFO GST_ELEMENT_PADS
>> gstelement.c:960:gst_element_get_static_pad: no such pad 'stream%d' in
>> element "rtspsrc0"
>> 0:00:00.457617018 6075 0x1195730 INFO GST_ELEMENT_PADS
>> gstutils.c:1221:gst_element_get_compatible_pad:<rtspsrc0> Could not
>> find
>> a compatible pad to link to fakesink0:sink
>> 0:00:00.457626795 6075 0x1195730 DEBUG GST_ELEMENT_PADS
>> gstutils.c:1797:gst_element_link_pads_full: we might have request pads
>> on both sides, checking...
>> 0:00:00.457635944 6075 0x1195730 DEBUG GST_ELEMENT_PADS
>> gstutils.c:1838:gst_element_link_pads_full: no link possible from
>> rtspsrc0 to fakesink0
>> RTSPSRC could not be linked!!!
>>
>> Where's the problem? Thanks for your help!
>> Hanno
>>
>>
>>
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>
>
> ------------------------------------------------------------------------------
> Beautiful is writing same markup. Internet Explorer 9 supports
> standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3.
> Spend less time writing and rewriting code and more time creating great
> experiences on the web. Be a part of the beta today
> http://p.sf.net/sfu/msIE9-sfdev2dev
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
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