Agingtv works but text doesnt

text.c

#include <ges/ges.h>
#define MAX_GES_LAYERS 100

GESTimeline* prepare_ges_timeline(const GESLayer **layers, int n_layers);
GESPipeline* prepare_ges_pipeline(GESTimeline* timeline, gboolean preview);
int run_ges_pipeline(GESPipeline *pipeline, gdouble duration, gboolean preview);





GESTimeline* prepare_ges_timeline(const GESLayer **layers, int n_layers) {
    GESTimeline *timeline;
    GESTrack *v, *a;
    v = GES_TRACK(ges_video_track_new ());
    a = GES_TRACK(ges_audio_track_new ());
    timeline = ges_timeline_new ();
    ges_timeline_add_track(timeline, v);
    ges_timeline_add_track(timeline, a);
    for (int i = 0; i < n_layers; ++i) {
        ges_timeline_add_layer(timeline, layers[i]);
    }
    return timeline;
}

GESPipeline* prepare_ges_pipeline(GESTimeline* timeline, gboolean preview) {
    GESPipeline *pipeline = ges_pipeline_new ();
    ges_pipeline_set_timeline(pipeline, timeline);
    if (preview == TRUE) {
        ges_pipeline_set_mode (pipeline, GES_PIPELINE_MODE_PREVIEW);
    } else {
        ges_pipeline_set_mode (pipeline, GES_PIPELINE_MODE_RENDER);
    }
    return pipeline;
}


int run_ges_pipeline(GESPipeline *pipeline, gdouble duration, gboolean preview) {
    GMainLoop *mainloop;
    GstStateChangeReturn state_change_return;

    state_change_return = gst_element_set_state (GST_ELEMENT (pipeline),
                                                      GST_STATE_PLAYING);

    if (state_change_return == GST_STATE_CHANGE_FAILURE) {
        g_printerr ("Unable to set the pipeline to the playing state.\n");
        gst_object_unref (pipeline);
        return -1;
    }

    if (preview == TRUE) {
        mainloop = g_main_loop_new (NULL, FALSE);
        g_timeout_add_seconds (duration,
                               (GSourceFunc) g_main_loop_quit,
                               mainloop);
        g_main_loop_run (mainloop);

    } else {

        GstBus *bus = gst_element_get_bus (pipeline);
        GstMessage *msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);

        /* Parse message */
        if (msg != NULL) {
            GError *err;
            gchar *debug_info;

            switch (GST_MESSAGE_TYPE (msg)) {
            case GST_MESSAGE_ERROR:
                gst_message_parse_error (msg, &err, &debug_info);
                g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
                g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
                g_clear_error (&err);
                g_free (debug_info);
                break;
            case GST_MESSAGE_EOS:
                g_print("Done");
                break;
            default:
                /* We should not reach here because we only asked for ERRORs and EOS */
                g_printerr ("Unexpected message received.\n");
                break;
            }
            gst_message_unref (msg);
        }

        
    }

    return 0;
}




void child_added(GESContainer *c, GESTrackElement *timeline_element, gpointer user_data) {
    g_print("child added\n");
    
    ges_timeline_commit_sync(user_data);
    
}

void core(gchar** videos, int length, gchar* output_file) {

    GESPipeline *pipeline;
    GESTimeline *timeline;
    GESClip *clips[1000];
    GESLayer *layers[MAX_GES_LAYERS];
    gboolean preview = TRUE;
    gdouble duration = 0;
    gint n_clips = 0;
    
    gst_init(NULL, NULL);
    ges_init();   
    
    GESLayer *layer;
    layer = ges_layer_new ();
    g_object_set (layer, "priority", 1, NULL);
    for (int i = 0; i < length; i++) {
        gchar *uri = gst_filename_to_uri (videos[i], NULL);
        g_print ("Adding %s to timeline...\n", uri);
        GESClip *clip = GES_CLIP(ges_uri_clip_new (uri));
        guint64 clip_duration = (guint64) 3 * GST_SECOND;
        g_object_set (clip,
                      "start", (guint64) 3 * i * GST_SECOND,
                      "duration", clip_duration,
                      "priority", (guint32) 5,
                      "in-point", (guint64) 0,
                      NULL);
        duration += (gdouble) 3;
        ges_layer_add_clip(layer, clip);
        clips[i] = clip;
        n_clips += 1;
    }

    
    layers[0] = layer;
    timeline = prepare_ges_timeline(layers, 1);


    
    for (int i = 0; i < n_clips; ++i) {
        GESClip *clip = clips[i];
        GESTimelineElement *timeline_element = GES_TIMELINE_ELEMENT(ges_effect_new("textoverlay text=\"Room A\" valignment=top halignment=left font-desc=\"Sans, 72\""));
        /* GESTimelineElement *timeline_element = GES_TIMELINE_ELEMENT(ges_effect_new("agingtv")); */
        ges_container_add(clip, timeline_element);
        g_object_set(timeline_element,
                     "start", (guint64) 3 * i * GST_SECOND,
                     "duration", 3 * GST_SECOND,
                     /* "priority", (guint32) 0, */
                     "in-point", (guint64) 0,
                     NULL);
        g_signal_connect(clip, "child-added", child_added, timeline);
    }


    
    ges_timeline_commit_sync(timeline);



    
    pipeline = prepare_ges_pipeline(timeline, preview);
    return run_ges_pipeline(pipeline, duration, preview);
}







int main(int argc, char**argv) {
    gchar* output_file = argv[1];
    gchar* va = argv[2];
    gchar* vb = argv[3];
    gchar* vc = argv[4];
    gchar* videos[] = { vb }; //, vb, vc };
    core(videos, 1, output_file);
    return 0;
}