Problem with gstreamer using the tsdemux
Tony Houghton
h at realh.co.uk
Tue Oct 6 15:33:32 UTC 2020
I think tsdemux is badly broken at the moment. I'm having a similar
experience to you: sometimes it works, then you change something that
should be completely irrelevant (in your case constructing the pipeline in
C++ instead of using gst-launch; in my case I've found that just changing
the log level can make a difference) and the pipeline freezes. See also issue
1419
<https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/issues/1419>.
I've just tried adding a queue2 to my manager element where its sink is
linked with my internal source (has a single src pad with caps
"video/mpegts, systemstream = (boolean) true;") and the queue2's src is the
target of my manager's src ghost pad. This made things worse. Highlights
from the log of `gst-launch-1.0 playbin uri="htsp://..."`:
0:00:00.088988232 24066 0x5591eb207ea0 INFO GST_ELEMENT_FACTORY
gstelementfactory.c:363:gst_element_factory_create: creating element
"tsdemux"
0:00:00.089118072 24066 0x5591eb207ea0 INFO GST_ELEMENT_PADS
gstelement.c:752:gst_element_add_pad:<MpegTSBase at 0x7fac2c1d8000> adding pad
'sink'
0:00:00.089291804 24066 0x5591eb207ea0 INFO GST_PADS
gstpad.c:2377:gst_pad_link_prepare: trying to link typefind:src and
tsdemux0:sink
0:00:00.089306656 24066 0x5591eb207ea0 INFO GST_PADS
gstpad.c:2585:gst_pad_link_full: linked typefind:src and tsdemux0:sink,
successful
0:00:00.089310744 24066 0x5591eb207ea0 INFO GST_EVENT
gstevent.c:1610:gst_event_new_reconfigure: creating reconfigure event
0:00:00.089334061 24066 0x5591eb207ea0 INFO GST_STATES
gstelement.c:2769:gst_element_continue_state:<tsdemux0> completed state
change to READY
0:00:00.089340768 24066 0x5591eb207ea0 INFO GST_STATES
gstelement.c:2669:_priv_gst_element_state_changed:<tsdemux0> notifying
about state-changed NULL to READY (VOID_PENDING pending)
0:00:00.089424733 24066 0x5591eb207ea0 INFO GST_ELEMENT_PADS
gstelement.c:1006:gst_element_get_static_pad: no such pad 'video_%01x_%05x'
in element "tsdemux0"
0:00:00.089433342 24066 0x5591eb207ea0 INFO GST_ELEMENT_PADS
gstelement.c:1006:gst_element_get_static_pad: no such pad 'audio_%01x_%05x'
in element "tsdemux0"
0:00:00.089437649 24066 0x5591eb207ea0 INFO GST_ELEMENT_PADS
gstelement.c:1006:gst_element_get_static_pad: no such pad
'subpicture_%01x_%05x' in element "tsdemux0"
0:00:00.089441946 24066 0x5591eb207ea0 INFO GST_ELEMENT_PADS
gstelement.c:1006:gst_element_get_static_pad: no such pad
'private_%01x_%05x' in element "tsdemux0"
0:00:00.089528559 24066 0x5591eb207ea0 WARN task
gsttask.c:890:gst_task_join:<srcqueue:src> trying to join task from its
thread
(gst-launch-1.0:24066): GStreamer-WARNING **: 15:40:38.404:
Trying to join task 0x5591eb225170 from its thread would deadlock.
You cannot change the state of an element from its streaming
thread. Use g_idle_add() or post a GstMessage on the bus to
schedule the state change from the main thread.
I think I'm going to have to give up on gstreamer and try to get my head
around something like MSE in a web app :-(.
On Tue, 6 Oct 2020 at 12:30, Torben <t.wiggerich at airrobot.de> wrote:
> Hi all,
>
> I have a problem to get the srcipt running in my application. So at first I
> tried to compile the following:
>
> gst-launch-1.0 -v udpsrc multicast-group=224.10.10.10 port=8008 ! tsdemux !
> h264parse ! avdec_h264 ! d3dvideosink sync=false
>
> It worked and displays the correct video.
>
> But if I try to do this in my application than happens nothing. I think the
> problem is that the event linkElements does not get called. So it comes
> from
> the pad-added signal of the tsdemux. I do not get any errors, or at least I
> cannot see them. So it seems for me that everything is ok. But the signal
> is
> not getting called...
>
> I run the following code with GST_DEBUG level 4. gstdebug(4).txt
> <
> http://gstreamer-devel.966125.n4.nabble.com/file/t379676/gstdebug%284%29.txt>
>
>
> Can you please tell me what I am doing wrong?
>
> #include <QCoreApplication>
> #include <gst/gst.h>
> #include <iostream>
>
> typedef struct
> {
> GstElement * pipeline = nullptr;
> GstElement * source = nullptr;
> GstElement * tsDemux = nullptr;
> GstElement * h264parse = nullptr;
> GstElement * avdecH264 = nullptr;
> GstElement * sinkVideo = nullptr;
> } VideoData;
>
> static void linkElements(GstElement* element,GstPad* sourcePad, gpointer
> sinkElement);
>
> int main(int argc, char *argv[])
> {
> QCoreApplication a(argc, argv);
> GMainLoop *loop;
>
> if (!g_thread_supported ())
> g_thread_init (nullptr);
>
> gst_init ( 0, 0 );
>
> loop = g_main_loop_new (nullptr, FALSE);
>
> VideoData m_data;
>
> m_data.pipeline = gst_pipeline_new ("player");
> m_data.source = gst_element_factory_make ("udpsrc", nullptr);
> m_data.tsDemux = gst_element_factory_make("tsdemux", nullptr);
> m_data.h264parse = gst_element_factory_make("h264parse", nullptr);
> m_data.avdecH264 = gst_element_factory_make("avdec_h264", nullptr);
> m_data.sinkVideo = gst_element_factory_make("d3dvideosink", nullptr);
>
> g_object_set(G_OBJECT (m_data.source), "multicast-group",
> "224.10.10.10", nullptr);
> g_object_set(G_OBJECT (m_data.source), "port", 8008, nullptr);
> g_object_set(G_OBJECT (m_data.sinkVideo), "sync", false, nullptr);
>
> gst_bin_add_many(GST_BIN(m_data.pipeline), m_data.source,
> m_data.tsDemux, m_data.h264parse, m_data.avdecH264, m_data.sinkVideo,
> nullptr);
>
> std::cout << "Start linking all elements..." << std::endl;
>
> if ( gst_element_link (m_data.source, m_data.tsDemux ) != TRUE )
> {
> std::cout << "1: Element could not be linked." << std::endl;
> gst_object_unref (m_data.pipeline);
> return 0;
> }
>
> g_signal_connect(m_data.tsDemux, "pad-added", G_CALLBACK(linkElements),
> nullptr); //nullptr //&m_data
>
> if ( gst_element_link_many(m_data.h264parse, m_data.avdecH264,
> m_data.sinkVideo, nullptr) != TRUE )
> {
> std::cout << "2: Element could not be linked." << std::endl;
> gst_object_unref (m_data.pipeline);
> return 0;
> }
>
> std::cout << "Linked all elements!" << std::endl;
>
> GstStateChangeReturn ret = gst_element_set_state(m_data.sinkVideo,
> GST_STATE_READY);
>
> ret = gst_element_set_state (m_data.pipeline, GST_STATE_PLAYING);
> if (ret == GST_STATE_CHANGE_FAILURE)
> {
> std::cout << "Unable to set the pipeline to the playing state." <<
> std::endl;
> gst_object_unref (m_data.pipeline);
> return 0;
> }
>
> g_main_loop_run (loop);
>
> return a.exec();
> }
>
> static void linkElements(GstElement* element,GstPad* sourcePad, gpointer
> sinkElement){
> std::cout << "Got here linkElements!" << std::endl; // It will never
> get
> here!
> GstPad*
> sinkPad=gst_element_get_static_pad((GstElement*)sinkElement,"sink");
> gst_pad_link(sourcePad,sinkPad);
> gst_object_unref(sinkPad);
> }
>
>
>
>
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
--
TH
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