Crash when trying to stop pipeline containing encodebin

[Michael Guinzbourg]

I think the issue is very easy to reproduce: build any pipeline which has
encodebin element and ask encodebin to encode in mpeg2. then play any file
and try to restart pipeline when it reaches the end of file.

On 11 May 2016 at 02:19, Michael Guinzbourg <mguinzbourg at gmail.com> wrote:

> here's the piece of my code which builds the pipeline:
>
>  gst_bin_add_many (GST_BIN (pipeline), data.source, data.q,data.convert,
> data.filter, ebin, data.q1, data.sink, NULL);
>   if (!gst_element_link_many (data.q, data.convert, data.filter, ebin,
> data.q1, data.sink, NULL)) {
>     g_printerr ("Elements could not be linked.\n");
>     gst_object_unref (pipeline);
>     return -1;
>   }
>
> on padd added signal callback I link data.source and data.q.
> My source is a live video stream which plays chunks of video and ends
> every 5 sec. at the EOS event I try to restart pipeline so I can play the
> next chunk. If I encode in H264 this works perfect. If I encode in mpeg2 it
> crashes at the following line (in bold):
>
>           case GST_MESSAGE_EOS:
>                     g_print("EOS received on OBJ NAME
> %s\n",GST_OBJECT_NAME(msg->src));
> *gst_element_set_state (pipeline, GST_STATE_READY);*
>             gst_element_set_state (pipeline, GST_STATE_PLAYING);
>                     break;
>
> encode element doesn't print any debug info after pipeline starts running,
> just crashes with no cry for help at *gst_element_set_state (pipeline,
> GST_STATE_READY);*
>
> On 11 May 2016 at 02:09, Sebastian Dröge <sebastian at centricular.com>
> wrote:
>
>> On Mi, 2016-05-11 at 02:07 -0400, Michael Guinzbourg wrote:
>> > I've set GST_DEBUG to "encodebin:6". I've got all kinds of all good
>> > info during encodebin initialization (I will copy it below my
>> > report). All the debug messages were posted before pipeline started
>> > to run and there was absolutely nothing until the sudden crash at the
>> > bold line in my code below. The piece of code that produces the crash
>> > is here (in the bus callback):
>> >
>> >  case GST_MESSAGE_EOS:
>> >                     g_print("EOS received on OBJ NAME
>> > %s\n",GST_OBJECT_NAME(msg->src));
>> >                   gst_element_set_state (pipeline, GST_STATE_READY);
>> >                   gst_element_set_state (pipeline,
>> > GST_STATE_PLAYING);
>> >                     break;
>> >
>> > If I change my encoding to H264 - this code runs normally and restart
>> > the pipeline without any problem.
>> > Below is the debug output - there's nothing at all after the pipeline
>> > starts running.
>> >
>> > Again, if I replace gst_element_set_state (pipeline,
>> > GST_STATE_READY); line with gst_element_set_state (<element_name>,
>> > GST_STATE_READY); where <element_name> is any element except for
>> > encodebin then gstreamer doesn't crash. It only crashes when I
>> > command the pipeline or encodebin to stop. It looks to me that
>> > gstreamer crashes when I try to bring encodebin to the stopped state,
>> > which is something to do with inability to sync the encodebin clock
>> > with the rest of the pipeline.
>> > Below is the copy of the debug output.
>>
>> Can you get a backtrace (of all threads) of the crash with gdb?
>>
>> It's a bit curious that you don't get any further debug output. Can you
>> also share your code, or simplified code that reproduces the problem?
>>
>> --
>> Sebastian Dröge, Centricular Ltd · http://www.centricular.com
>>
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
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