gst_element_get_state hangs

[Mohammad-AL.Gmail]

Thanks Stirling,

 

When gst_element_get_state call returns GST_STATE_CHANGE_ASYNC, I believe,
we can wait and check again the state of pipeline using
gst_element_get_state.

However, when it returns GST_STATE_CHANGE_FAILURE, what action do you
normally take?

 

Also, what does the function bus_message_handler(app, msg) do?

 

From:
gstreamer-devel-bounces+al.mohamed.salim=gmail.com at lists.freedesktop.org
[mailto:gstreamer-devel-bounces+al.mohamed.salim=gmail.com at lists.freedesktop
.org] On Behalf Of Stirling Westrup
Sent: Tuesday, May 07, 2013 11:37 PM
To: Discussion of the development of and with GStreamer
Subject: Re: gst_element_get_state hangs

 

Most likely the pipeline is getting stuck trying to change state. You want
to ensure that you put in a reasonable timeout for the gst_element_get_state
call. If the call does time out (returns GST_STATE_CHANGE_FAILURE or
GST_STATE_CHANGE_ASYNC) then you should check the message bus for errors. I
use this little function for that:

// Returns true is any messages were found on the bus.

static gboolean message_check
  ( App * app
  )
  { gboolean     ret = FALSE;
    GstBus     * bus = gst_pipeline_get_bus(app->pipeline);
    GstMessage * msg = gst_bus_pop(bus);
   
    while(msg)
      {
        ret |= bus_message_handler(app,msg);
        gst_message_unref(msg);
        msg = gst_bus_pop(bus);
      }
    gst_object_unref(bus);
    return ret;
  }

 

On Tue, May 7, 2013 at 9:30 AM, Mohammad-AL.Gmail
<al.mohamed.salim at gmail.com> wrote:

In my GStreamer (0.10.32) based player, I switch pipeline to PAUSE and then
switch state to NULL instead of READY after playback of a file is finished
and then unref the pipeline.

However, I face a problem, when I play media files in a folder one after
another:

 

The playback of files goes OK one after another. 

However once a while the GStreamer hangs when I turn the status of the
pipeline to GST_STATE_PLAY.

Creation of playbin2, setting uri, and getting message bus goes  OK. It
hangs only when state is switch to READY.

 

I am not able to make out which part / element blocks the pipeline. 

Once this happen, the pipeline becomes non-responsive.

 

Regards,

Salim


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