Force stopping a gstreamer pipeline

[marcin at saepia.net]

My experience with JACK is that when the JACK daemon deadlocks due to
failure of any client (or one of JACK internal bugs) the result in
GStreamer may be also a deadlock as it waits indefinitely for processing.

In practice I found JACK not suitable for anything serious.

Marcin

2016-06-06 16:45 GMT+02:00 Thomas Scheuermann <scheuermann at barco.com>:

> Hi,
>
> Am 03.06.2016 um 12:59 schrieb Nicolas Dufresne:
>
>
> Le 3 juin 2016 5:06 AM, "Thomas Scheuermann" < <scheuermann at barco.com>
> scheuermann at barco.com> a écrit :
> >
> > Hello,
> >
> > is there a way to force the stopping of a gstreamer pipeline?
> > We have here a process running with several pipelines which are started
> > and stopped dynamically. Sometimes it happens that when I set the state
> > of the pipeline to GST_STATE_NULL (gst_element_set_state(_pipeline,
> > GST_STATE_NULL);) this call never comes back.
> > What can I do in this situation?
> > I use gstreamer 1.8.1
> >
>
> This is a deadlock. It should not happen unless you are doing something
> wrong in your application, or if you have hit a big in GStreamer. You may
> want to share a full backtrace.
>
> Nicolas
>
> Here is a sample code of a deadlock. I think, it is in jackaudiosink.
> If you restart the jack daemon while the pipeline is playing, the pipeline
> can't be stopped anymore.
>
> /*
>  * reproducer for deadlock
>  *
>  * gcc -o deadlock deadlock.c -g `pkg-config --libs --cflags
> gstreamer-1.0` -Wall
>  */
> #include <stdio.h>
> #include <gst/gst.h>
>
> int main(int argc, char **argv)
> {
>     GstElement *pipeline;
>     GstElement *audiosrc;
>     GstElement *audiofilter;
>     GstElement *audiosink;
>     GstCaps *caps;
>
>     gst_init(&argc, &argv);
>
>     pipeline = gst_pipeline_new("pipeline");
>     g_assert(pipeline);
>
>     audiosrc = gst_element_factory_make("audiotestsrc", "audiotestsrc");
>     g_assert(audiosrc);
>
>     audiofilter = gst_element_factory_make("capsfilter", "capsfilter");
>     g_assert(audiofilter);
>     caps = gst_caps_new_simple("audio/x-raw", "channels", G_TYPE_INT, 2,
> NULL);
>     g_object_set(G_OBJECT(audiofilter), "caps",caps, NULL);
>     gst_caps_unref(caps);
>
>     audiosink = gst_element_factory_make("jackaudiosink", "jackaudiosink");
>     g_assert(audiosink);
>     g_object_set(G_OBJECT(audiosink), "client-name", "test", NULL);
>
>     g_print("Adding elements\n");
>     gst_bin_add_many(GST_BIN(pipeline), audiosrc, audiofilter, audiosink,
> NULL);
>
>     gst_element_link_many(audiosrc, audiofilter, audiosink, NULL);
>
>     g_print("Set pipeline state to playing\n");
>     gst_element_set_state(pipeline, GST_STATE_PLAYING);
>
>     g_print("Restart jack daemon and press enter\n");
>     getchar();
>
>     g_print("Set pipeline state to null\n");
>     gst_element_set_state(pipeline, GST_STATE_NULL);
>     g_print("Unref pipeline\n");
>     gst_object_unref(pipeline);
>
>     return 0;
> }
>
>
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