How to properly terminate a complex stream with tee and avimux

[tnewman]

Tim,

Thank you very much!  That seems to have worked.  I will continue testing,
the pipeline does not seem to be extremely stable just yet.  It seems to
work for a few video recordings and then simply hangs.  Not sure what is
hanging.  Also, the start up of the pipeline for the first time adding the
recording pipeline segment seg-faults from time to time.  Any ideas on
that?  I suspect that this is the same cause for the hanging mentioned
earlier.

Regards,
Tye


On Tue, Aug 12, 2014 at 4:08 AM, Tim Müller [via GStreamer-devel] <
ml-node+s966125n4668277h99 at n4.nabble.com> wrote:

> On Mon, 2014-08-11 at 06:25 -0700, tnewman wrote:
>
> Hi,
>
> > I have been attempting to create a complex pipeline with some success
> except
> > for how to close the video saving (avimux) portion of the stream.  Below
> one
> > will find an illustration of the pipeline.
> >
> >
> >
> > Here is the story:  I have an embedded device where I need to create a
> video
> > stream to a fakesink; where the fakesink is used to hand framebuffers to
> a
> > Qt application to be displayed in a widget.  This is the primary stream
> > connected to the tee as seen above.  The second portion of the stream is
> the
> > connected to the tee on request (a user pushes a Qt button) and begins
> > recording an AVI file to disk.  The addition of this pipeline to the tee
> > seems to be working (most of the time, sometimes the pipeline hangs; but
> > that is for later).  The issue is when the user presses the Qt button
> again
> > to stop the recording.  The first time through it works, the filesink
> sees a
> > EOS event and the file terminates with an updated header.  The problem
> comes
> > the second time around.  From the g_print statements one sees this:
> >
> >
> >
> > And thereafter the pipeline fails.
> >
> > Below one will find the source code for the project.  Any help would be
> > greatly appreciated.
> >
> >
> >
> > I have tried may variants with no success. So the real question is: how
> does
> > one unlink a section of the pipeline from the tee, terminate the avimux
> and
> > audio source elements to create a proper AVI file, remove the elements
> from
> > the pipeline and then at a later time recreate these elements, link
> them,
> > and do it all over again.
>
> event_probe_cb() will be called from the streaming thread, the same
> thread you want to shut down. This won't really work well like this.
> What you should work better is something like this:
>
>  - set g_object_set (pipeline, "message-forward", TRUE, NULL)
>    so you get a message on the bus even if just filesink is EOS
>    (but not the other sink)
>
>  - wait for an GST_MESSAGE_ELEMENT on the bus like this:
>
>     case GST_MESSAGE_ELEMENT:{
>       const GstStructure *s = gst_message_get_structure (msg);
>
>       if (gst_structure_has_name (s, "GstBinForwarded")) {
>         GstMessage *forward_msg = NULL;
>
>         gst_structure_get (s, "message", GST_TYPE_MESSAGE, &forward_msg,
> NULL);
>         if (GST_MESSAGE_TYPE (forward_msg) == GST_MESSAGE_EOS) {
>            ... shut down / remove pipeline branch ...
>         }
>       }
>       break;
>     }
>
>  - This assumes you unlinked the tee branch and sent an EOS
>    yourself on the queue's sink pad before jpegenc and
>    to audiotestsrc via gst_element_send_event().
>
>  Cheers
>   -Tim
>
> --
> Tim Müller, Centricular Ltd - http://www.centricular.com
>
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