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POFailure adding filter to pipeline in gstreamer
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copied!<p>I'm trying to do the exercise at the end of the Basic GStreamer tutorial here: <a href="http://docs.gstreamer.com/display/GstSDK/Basic+tutorial+2%3a+GStreamer+concepts" rel="nofollow">Basic Tutorial 2</a>. The exercise is merely to add a filter to a video. The exercise says to simply add the "vertigoTV" effect, so I did that.</p> <p>Here are the relevant parts to my attempt:</p> <pre><code> #include <gst/gst.h> int main(int argc, char *argv[]) { GstElement *pipeline, *source, *filter, *convert, *sink; GstBus *bus; GstMessage *msg; GstStateChangeReturn ret; /* Initialize GStreamer */ gst_init (&argc, &argv); /* Create the elements */ source = gst_element_factory_make ("videotestsrc", "source"); filter = gst_element_factory_make ("vertigotv", "filter"); sink = gst_element_factory_make ("autovideosink", "sink"); /* Create the empty pipeline */ pipeline = gst_pipeline_new ("test-pipeline"); if (!pipeline || !source || !filter || !sink) { g_printerr ("Not all elements could be created.\n"); return -1; } /* Build the pipeline */ gst_bin_add_many (GST_BIN (pipeline), source, filter, sink, NULL); if (gst_element_link_many (source, filter, sink, NULL) != TRUE) { g_printerr ("Could not link all elements.\n"); gst_object_unref (pipeline); return -1; } /* Modify the source's properties */ g_object_set (source, "pattern", 0, NULL); /* Start playing */ ret = gst_element_set_state (pipeline, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) { g_printerr ("Unable to set the pipeline to the playing state.\n"); gst_object_unref (pipeline); return -1; } /* Wait until error or EOS */ bus = gst_element_get_bus (pipeline); 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 ("End-Of-Stream reached.\n"); 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); } /* Free resources */ gst_object_unref (bus); gst_element_set_state (pipeline, GST_STATE_NULL); gst_object_unref (pipeline); return 0; } </code></pre> <p>However, the return value is a GST_STATE_CHANGE_FAILURE. Any idea why?</p> <p>Thanks so much!</p>

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