[Bug 743938] New: Strange issue with GES_PIPELINE_MODE_RENDER

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743938
  GStreamer | gst-editing-services | git master

           Summary: Strange issue with GES_PIPELINE_MODE_RENDER
    Classification: Platform
           Product: GStreamer
           Version: git master
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-editing-services
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: polezhaiev at ukr.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I want to use GESProject and GESPipeline to render .xges file into the .webm
one. My code looks like this:

        ...
        project = ges_project_new(uri); /// URI of XGES file
        GESTimeline *timeline =
GES_TIMELINE(ges_asset_extract(GES_ASSET(project), &error));
        if (error)
        ...
        /// I handle error here
        ...
        else
        {
            pipeline = ges_pipeline_new();
            ges_pipeline_set_timeline(pipeline, timeline);
            gchar *uri = g_strdup_printf("file://" RAMFS_PATH "t%"
G_GUINT64_FORMAT ".webm", operation_identifier); /// Yet another URI: .webm
file where output should be directed
            ges_pipeline_set_render_settings(pipeline, uri,
GST_ENCODING_PROFILE(encoding_profile)); /// WebM with vp8 and Vorbis
            g_free(uri);
            ges_pipeline_set_mode(pipeline, GES_PIPELINE_MODE_RENDER);
            ...
            /// Here I attach some stuff to bus to handle errors, eos, etc.
            ...
            gst_element_set_state(GST_ELEMENT(pipeline), GST_STATE_PLAYING);
            ...

I face a problem causing pipeline to work infinte time without sending error or
EOS messages to bus. It happens first time I run pipeline. Second (and
subsequent) pipelines seem to work without this error (or at least it becames
rare). With gst-editing-services from git master error looks like this:

ERROR         nlecomposition
nle/nlecomposition.c:2524:_relink_children_recursively: Not enough sinkpads to
link all objects to the operation ! 1 / 0
ERROR         nlecomposition
nle/nlecomposition.c:2527:_relink_children_recursively: Operation has no child
objects to be connected to !!!

In GES 1.4.0 error looks a bit different:

ERROR         gnlcomposition gnlcomposition.c:2385:compare_relink_single_node:
Not enough sinkpads to link all objects to the operation ! 2 / 0
ERROR         gnlcomposition gnlcomposition.c:2387:compare_relink_single_node:
Operation has no child objects to be connected to !!!

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