Problem linking rtspsrc to any other element

[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


------------------------------------------------------------------------------
What happens now with your Lotus Notes apps - do you make another costly
upgrade, or settle for being marooned without product support? Time to move
off Lotus Notes and onto the cloud with Force.com, apps are easier to build,
use, and manage than apps on traditional platforms. Sign up for the Lotus
Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d
_______________________________________________
gstreamer-devel mailing list
[hidden email]
https://lists.sourceforge.net/lists/listinfo/gstreamer-devel