no such pad 'video_%04x' in element "tsdemux"

[Maxime Louvel]

HI,

I'm trying to build the following pipeline with a C application :
gst-launch -e udpsrc port=5000 caps="application/x-rtp, media=video,
encoding-name=MP2T-ES" ! rtpmp2tdepay ! mpegtsdemux ! filesink
location=videodstRDO.mpeg

when using gst-launch it works fine, but when I use a C application here is
the error I get (with GST_DEBUG=3) :
0:00:00.032693078 12164 0x1912010 INFO GST_ELEMENT_PADS
gstutils.c:1698:gst_element_link_pads_full: trying to link element
tsdemux:(any) to element mpeg2dec:(any)
0:00:00.032735773 12164 0x1912010 INFO GST_ELEMENT_PADS
gstelement.c:972:gst_element_get_static_pad: no such pad 'video_%04x' in
element "tsdemux"
0:00:00.032759563 12164 0x1912010 INFO GST_ELEMENT_PADS
gstutils.c:1216:gst_element_get_compatible_pad:<tsdemux> Could not find a
compatible pad to link to mpeg2dec:sink

here is the code I wrote :

...
source = gst_element_factory_make ("udpsrc", "rtpsrc");
rtpdepay = gst_element_factory_make ("rtpmp2tdepay", "rtpdepay");
tsdemux = gst_element_factory_make ("mpegtsdemux", "tsdemux");
sink = gst_element_factory_make ("filesink", "filesink");

g_object_set (source, "port", 5000, NULL);
/* we need to set caps on the udpsrc for the RTP data */
caps = gst_caps_from_string ("application/x-rtp, media=video,
encoding-name=MP2T-ES");
g_object_set (source, "caps", caps, NULL);
gst_caps_unref (caps);

g_object_set (sink, "location", "/tmp/video.mpeg", NULL);

/* build pipeline */
gst_bin_add_many (GST_BIN (pipeline), source, rtpdepay, tsdemux, sink,
NULL);
if(!gst_element_link_many (source, rtpdepay, tsdemux, sink, NULL))
{
g_printerr ("Could not link pipeline. \n");
return -1;
}

when I execute the application, the call to gst_element_link_many fails and
the program exit with my error msg.

Do you know what might be wrong ?

thanks,
Max

[Emile Semmes]

Hi Maxime,

For mpegtsdemux, you can't link the src pads until they are added. This
happens during runtime so you'll need to add a signal handler on the
pad-added signal from the mpegtsdemux element. Take a look at section
8.1 of the documentation
(http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-pads.html)
for an example on how this is done. Section 8.1.1 uses oggdemux but the
method is the same. In your callback, you can link your pad there. Pay
attention to the caps since you don't until later if it's an audio or
video track.

HTH,

Emile

--
Emile Semmes
Software Consultant
e6 Group, LLC
Office: [phone]
www.e6group.com

Post by Maxime Louvel
HI,
gst-launch -e udpsrc port=5000 caps="application/x-rtp, media=video,
encoding-name=MP2T-ES" ! rtpmp2tdepay ! mpegtsdemux ! filesink
location=videodstRDO.mpeg
when using gst-launch it works fine, but when I use a C application
0:00:00.032693078 12164 0x1912010 INFO GST_ELEMENT_PADS
gstutils.c:1698:gst_element_link_pads_full: trying to link element
tsdemux:(any) to element mpeg2dec:(any)
0:00:00.032735773 12164 0x1912010 INFO GST_ELEMENT_PADS
gstelement.c:972:gst_element_get_static_pad: no such pad 'video_%04x'
in element "tsdemux"
0:00:00.032759563 12164 0x1912010 INFO GST_ELEMENT_PADS
gstutils.c:1216:gst_element_get_compatible_pad:<tsdemux> Could not
find a compatible pad to link to mpeg2dec:sink
...
source = gst_element_factory_make ("udpsrc", "rtpsrc");
rtpdepay = gst_element_factory_make ("rtpmp2tdepay", "rtpdepay");
tsdemux = gst_element_factory_make ("mpegtsdemux", "tsdemux");
sink = gst_element_factory_make ("filesink", "filesink");
g_object_set (source, "port", 5000, NULL);
/* we need to set caps on the udpsrc for the RTP data */
caps = gst_caps_from_string ("application/x-rtp, media=video,
encoding-name=MP2T-ES");
g_object_set (source, "caps", caps, NULL);
gst_caps_unref (caps);
g_object_set (sink, "location", "/tmp/video.mpeg", NULL);
/* build pipeline */
gst_bin_add_many (GST_BIN (pipeline), source, rtpdepay, tsdemux, sink,
NULL);
if(!gst_element_link_many (source, rtpdepay, tsdemux, sink, NULL))
{
g_printerr ("Could not link pipeline. \n");
return -1;
}
when I execute the application, the call to gst_element_link_many
fails and the program exit with my error msg.
Do you know what might be wrong ?
thanks,
Max
--
Maxime Louvel
web page : https://sites.google.com/site/mlouvel/
linkedin : http://fr.linkedin.com/in/mlouvel
address : 5400-B ridge oak drive
Austin, Texas, 78731
USA
_______________________________________________
gstreamer-devel mailing list
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

[Maxime Louvel]

thanks Emile,
it works

Post by Emile Semmes
Hi Maxime,
For mpegtsdemux, you can't link the src pads until they are added. This
happens during runtime so you'll need to add a signal handler on the
pad-added signal from the mpegtsdemux element. Take a look at section 8.1
of the documentation (
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-pads.html)
for an example on how this is done. Section 8.1.1 uses oggdemux but the
method is the same. In your callback, you can link your pad there. Pay
attention to the caps since you don't until later if it's an audio or video
track.
HTH,
Emile
--
Emile Semmes
Software Consultant
e6 Group, LLC
Office: [phone]www.e6group.com
HI,
gst-launch -e udpsrc port=5000 caps="application/x-rtp, media=video,
encoding-name=MP2T-ES" ! rtpmp2tdepay ! mpegtsdemux ! filesink
location=videodstRDO.mpeg
when using gst-launch it works fine, but when I use a C application here
0:00:00.032693078 12164 0x1912010 INFO GST_ELEMENT_PADS
gstutils.c:1698:gst_element_link_pads_full: trying to link element
tsdemux:(any) to element mpeg2dec:(any)
0:00:00.032735773 12164 0x1912010 INFO GST_ELEMENT_PADS
gstelement.c:972:gst_element_get_static_pad: no such pad 'video_%04x' in
element "tsdemux"
0:00:00.032759563 12164 0x1912010 INFO GST_ELEMENT_PADS
gstutils.c:1216:gst_element_get_compatible_pad:<tsdemux> Could not find a
compatible pad to link to mpeg2dec:sink
...
source = gst_element_factory_make ("udpsrc", "rtpsrc");
rtpdepay = gst_element_factory_make ("rtpmp2tdepay", "rtpdepay");
tsdemux = gst_element_factory_make ("mpegtsdemux", "tsdemux");
sink = gst_element_factory_make ("filesink", "filesink");
g_object_set (source, "port", 5000, NULL);
/* we need to set caps on the udpsrc for the RTP data */
caps = gst_caps_from_string ("application/x-rtp, media=video,
encoding-name=MP2T-ES");
g_object_set (source, "caps", caps, NULL);
gst_caps_unref (caps);
g_object_set (sink, "location", "/tmp/video.mpeg", NULL);
/* build pipeline */
gst_bin_add_many (GST_BIN (pipeline), source, rtpdepay, tsdemux, sink,
NULL);
if(!gst_element_link_many (source, rtpdepay, tsdemux, sink, NULL))
{
g_printerr ("Could not link pipeline. \n");
return -1;
}
when I execute the application, the call to gst_element_link_many fails
and the program exit with my error msg.
Do you know what might be wrong ?
thanks,
Max
--
Maxime Louvel
web page : https://sites.google.com/site/mlouvel/
linkedin : http://fr.linkedin.com/in/mlouvel
address : 5400-B ridge oak drive
Austin, Texas, 78731
USA
_______________________________________________
--
--
Emile Semmes
Owner / Software Consultant
e6 Group, LLC
Office: [phone]www.e6group.com
_______________________________________________
gstreamer-devel mailing list
http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel