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Problem linking rtspsrc to any other element

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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



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shuyufu
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Re: Problem linking rtspsrc to any other element

shuyufu
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);
}

於 2010/11/21 上午 12:55, Hanno Jaspers 提到:

> 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
>
>
>
> ------------------------------------------------------------------------------
> 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
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> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel


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Spend less time writing and  rewriting code and more time creating great
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Hanno Jaspers
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Re: Problem linking rtspsrc to any other element

Hanno Jaspers
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
>>
>>
>>
>> ------------------------------------------------------------------------------
>> 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
>> [hidden email]
>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>
> ------------------------------------------------------------------------------
> 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
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parthlathiya
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Re: Problem linking rtspsrc to any other element

parthlathiya
This post was updated on .
Facing the same issue but in python.

I also have kind of the same problem here. I am replicating the function of element uridecodebin to my own custom nbin which can work with MJPEG RTSP stream. For that I am using rtspsrc and rtpjpegdepay inside the custom bin and linking them when rtspsrc received the pad added signal. Yet, I cannot link them with element_src_pad.link(peer_element_sink_pad) both of which having the same capabilities of pads as seen using

gst-inspect-1.0 rtspsrc and get-inspect-1.0 rtpjpegdepay.

Unable to link elements(rtspsrc -> rtpjpegdepay) from child_added signal callback

I'm trying to get an MJPEG encoded RTSP stream from Mobotix brand camera using python script and gstreamer.
1st Try:
    Tried using **uridecodebin** ! **autovideosink** but gave internal data **stream error** for mjpeg format.
   
2nd Try:
    Tried to lookup what elements are used for jpeg decoding (nvjpegdecoder). Also tried to set **property** "**DeepStream**" to **True** in nvjpegdec element but still not worked.

3rd Try:
    Created a **custom bin** with elements to support jpeg stream over RTSP sources.
    The cutom bin ghost src pad is also set to target src pad of nvvidconv element when the bin is created.
    The pipeline consists a custom bin (just like
    **uridecodebin**, that has **rtspsrc** ! **rtpjpegdepay** ! **jpegdec** ! **nvvidconv**) and **autovideosink**. My main aim is to stream an
    RTSP stream encoded in MJPEG format.

    I also verified the rtspsrc has src template that has capability of application/rtp as well as
    rtpjpegday has the sink pad's capability as application/rtp using gst-inspect-1.0 <element_name> command. So technically it should work but still the linking fails.

    rtspsrc : Receive data over the network via RTSP
        src : application/x-rtp
            application/x-rdt

    rtpjpegdepay: Extracts JPEG video from RTP packets (RFC 2435)
        sink : application/x-rtp
        src  : image/jpeg

I've also added the pad_added signal handler for **rtspsrc** and tried to link **rtspsrc** and **rtpjpegdepay** src and sink pads in the callback function but it fails
somehow.

Note: I've also tried to run the pipeline from the command line and it successfully shows the video stream, but linking always fails
in python code.

    gst-launch-1.0 **rtspsrc** location=$RTSP_PATH ! **rtpjpegdepay** ! **jpegdec** ! **nvvidconv** ! **autovideosink**

Here is a snippet of main function

def main(args):
    if len(args) < 2: # Check the command if camera information given or not.
        sys.stderr.write("usage: %s <uri1> [uri2] ... [uriN]\n" % args[0])
        sys.exit(1)

    for i in range(0,len(args)-1):
        fps_streams["stream{0}".format(i)]=GETFPS(i)
    number_sources=len(args)-1

    # Standard GStreamer initialization
    GObject.threads_init() # Create thread for GObject
    Gst.init(None)

    # Create Pipeline element that will form a connection of other elements
    pipeline = Gst.Pipeline()
    is_live = False

    if not pipeline:
        sys.stderr.write(" Unable to create Pipeline \n")

    # Create nvstreammux instance to form batches from one or more sources.
    streammux = Gst.ElementFactory.make("nvstreammux", "Stream-muxer") # stream mux use to display videos in one display. If we have 4 video then it divide's 1 screen for 4 videos.
    if not streammux:
        sys.stderr.write(" Unable to create NvStreamMux \n")

    pipeline.add(streammux)
    for i in range(number_sources): # check how many cameras are connected
        uri_name=args[i+1]
        if uri_name.find("rtsp://") == 0 : # check if the streaming is RTSP link
            is_live = True
        source_bin=make_video_source(i,uri_name)
       
        if not source_bin:
            sys.stderr.write("Unable to create source bin \n")
        pipeline.add(source_bin)
        padname="sink_%u" %i
        sinkpad= streammux.get_request_pad(padname) # set windows according to camera
        if not sinkpad:
            sys.stderr.write("Unable to create sink pad bin \n")
        srcpad=source_bin.get_static_pad("src")
        if not srcpad:
            sys.stderr.write("Unable to create src pad bin \n")

        srcpad.link(sinkpad)

.
.
.

Custom Bin Video source

    def make_video_source(i, uri):

    dict_data = {}

    bin_name="source-bin-%02d" %i
    nbin = None
    nbin = Gst.Bin.new(bin_name)

    ### Create elements
    source = Gst.ElementFactory.make("rtspsrc", f'source_{i}')
    depay = Gst.ElementFactory.make("rtpjpegdepay", f'depay_{i}')
    decoder = Gst.ElementFactory.make("jpegdec", f'decode_{i}')
    conv = Gst.ElementFactory.make("nvvidconv", f'nvvidconv_{i}')

    ### set properties
    source.set_property("location", uri)

   
    ### Add elements to Gst Bin
    Gst.Bin.add(nbin, source)
    Gst.Bin.add(nbin, depay)
    Gst.Bin.add(nbin, decoder)
    Gst.Bin.add(nbin, conv)


    ### link elements
    depay.link(decoder)
    decoder.link(conv)

    # dict_data['queue'] = queue
    # dict_data['capsfilter'] = capsfilter
    dict_data['rtpjitterbuffer'] = rtpjitterbuffer
    dict_data['nbin'] = nbin
    # dict_data['typefind'] = typefind
    dict_data['source'] = source
    dict_data['depay'] = depay
    dict_data['decoder'] = decoder
    dict_data['conv'] = conv

    ### Add signal handler
    source.connect("pad-added", on_new_pad_added, dict_data)

    # Add ghost source pad to nbin
    conv_src_pad = conv.get_static_pad("src")
    bin_ghost_pad_ret = nbin.add_pad(Gst.GhostPad.new("src", conv_src_pad))
    if not bin_ghost_pad_ret:
        print(f'Failed to add ghost and link pad in source bin')
        return None
    else:

        bin_ghost_src_pad = nbin.get_static_pad("src")
        print(f'bin_ghost_src_pad: {bin_ghost_src_pad}')
        print(f'bin_ghost_src_pad name : {bin_ghost_src_pad.get_name()}')
        print(f'Created  src ghost pad and linked to : conv src pad, {conv_src_pad}')
        if (not bin_ghost_src_pad):
            print("Failed to get recently added src ghost pad src of bin. Exiting.\n")
            return None
   
    # release the src
    (conv_src_pad).unref()        # GST_OBJECT/GObject might cause error

    return nbin

New Pad added signal handler

    def on_new_pad_added(element, new_pad, dict_data):
    peer_sink_element =  dict_data['depay']
    peer_sink_pad = peer_sink_element.get_static_pad("sink")
   
    if(peer_sink_pad.is_linked()):
        print("peer_sink_element is already linked. Ignoring.\n")
        return
    else:
        print("peer_sink_element is not linked already. Continuing linking.\n")
   
    print('\n\n\n')
    print(f'---------------- new padd added ----------------')
    print(f'\nInfo')
    print(f'source element name - {element.get_name()}')
    print(f'source : {element}')

    print(f'\nInfo: peer element')
    print(f'peer_sink_element name : {peer_sink_element.get_name()}')
    print(f'peer_sink_element : {peer_sink_element}')

    print(f'\nInfo: incomming pad')
    print(f'new src pad name: {new_pad.get_name()}')

    # check pad type/name
    if(new_pad_type.find("application/x-rtp")!=-1):

        print(f'found application/x-rtp in caps')
        if not new_pad.is_linked():
           
            # if the other pad is linked anywhere, unlink it.
            if peer_sink_pad.is_linked():
                print(f'Peer sink pad is linked. Not Linking...')
                peer_sink_pad.get_peer().unlink(peer_sink_pad)
            else:
                print(f'Peer sink pad is also not linked. Linking...')

            # try to link the pad
            if not new_pad.link(peer_sink_pad):
                print(f'Failed to link decoder src pad to source bin ghost pad')

Log

    ---------------- rtspsrc new padd added ----------------

Info:
source element name - source_0
source : <__gi__.GstRTSPSrc object at 0x7f882e5c18 (GstRTSPSrc at 0xaa3e5d0)>


Info: peer element
peer_sink_element element name : depay_0
peer_sink_element : <__gi__.GstRtpJPEGSrc object at 0x7f88280678 (GstQueue at 0xb6540d0)>

Info: incomming pad
new src pad name : recv_rtp_src_0_1697348806_26

found rtp in caps
0:02:44.151083610 16703      0xaabb0a0 INFO                GST_PADS gstpad.c:2378:gst_pad_link_prepare: trying to link source_0:recv_rtp_src_0_1697348806_26 and queue_0:sink
0:02:44.151197361 16703      0xaabb0a0 INFO                GST_PADS gstpad.c:2586:gst_pad_link_full: linked source_0:recv_rtp_src_0_1697348806_26 and queue_0:sink, successful
0:02:44.151224757 16703      0xaabb0a0 INFO               GST_EVENT gstevent.c:1517:gst_event_new_reconfigure: creating reconfigure event
Failed to link decoder src pad to source bin ghost pad

Is there any way to know what's wrong with linking pads here?
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