hmm thanks for the help, im going to read more then. I got confused because on gst-launch it worked, i didnt realized that gst-launch was linking diferent. <div class="gmail_quote">On Thu, May 7, 2009 at 11:57 AM, Andrey Boyko <<a href="mailto:andreib@module.ru">andreib@module.ru</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div bgcolor="#ffffff" text="#000000"> Because gst-launch as an application do it for you. I think in function gst_parse_perform_delayed_link in file grammar.tab.c.<div><div></div><div class="h5"> Tiago Katcipis wrote: <blockquote type="cite">but why does it work every time with gst-launch? <div class="gmail_quote">On Thu, May 7, 2009 at 11:14 AM, Andrey Boyko <<a href="mailto:andreib@module.ru" target="_blank">andreib@module.ru</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div bgcolor="#ffffff" text="#000000"> wavparse element has 'sometimes' src pads so you can't just do gst_element_link (wavparse, convert); See <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/index.html</a> section 8.1.1 how to handle it. Tiago Katcipis wrote: <blockquote type="cite"> <div> <div>Im having some trouble making a wav player, when i try to build the pipeline using gst-launch it works fine, but the source code building the same pipeline generates an error. Im sorry if the question is stupid, im new at gstreamer and im not getting what im doing wrong :-(. I followed an example i found on gstreamer documentation. The gst-launch comand: gst-launch filesrc location="exemploWav.wav" ! wavparse ! audioconvert ! gconfaudiosink The source code that builds the same pipe (or at least it should build): #include <gst/gst.h> #include <glib.h> static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data) { GMainLoop *loop = (GMainLoop *) data; switch (GST_MESSAGE_TYPE (msg)) { case GST_MESSAGE_EOS: g_print ("End of stream\n"); g_main_loop_quit (loop); break; case GST_MESSAGE_ERROR: { gchar *debug; GError *error; gst_message_parse_error (msg, &error, &debug); g_free (debug); g_printerr ("Error: %s\n", error->message); g_error_free (error); g_main_loop_quit (loop); break; } default: g_print("Teste.....[%d]\n", GST_MESSAGE_TYPE (msg)); break; } return TRUE; } int main (int argc, char *argv[]) { GMainLoop *loop; GstElement *pipeline, *source, *sink, *convert, *wavparse; GstBus *bus; /* Initialisation */ gst_init (&argc, &argv); loop = g_main_loop_new (NULL, FALSE); /* Check input arguments */ if (argc != 2) { g_printerr ("Usage: %s <Wav filename>\n", argv[0]); return -1; } /* Create gstreamer elements */ pipeline = gst_pipeline_new ("wav_player"); source = gst_element_factory_make ("filesrc", "file_source"); wavparse = gst_element_factory_make ("wavparse", "wav_parser"); convert = gst_element_factory_make ("audioconvert", "audio_convert"); sink = gst_element_factory_make ("gconfaudiosink","gnome_output"); if (!pipeline || !source || !sink || !convert || !wavparse ) { g_printerr ("One element could not be created. Exiting.\n"); return -1; } /* Set up the pipeline */ /* we set the input filename to the source element */ g_object_set (G_OBJECT (source), "location", argv[1], NULL); /* we add a message handler */ bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline)); gst_bus_add_watch (bus, bus_call, loop); gst_object_unref (bus); /* we add all elements into the pipeline */ gst_bin_add_many (GST_BIN (pipeline), source, convert, wavparse, sink, NULL); /* we link the elements together */ gst_element_link (source, wavparse); gst_element_link (wavparse, convert); gst_element_link (convert, sink); /* Set the pipeline to "playing" state*/ g_print ("Now playing: %s\n", argv[1]); gst_element_set_state (pipeline, GST_STATE_PLAYING); /* Iterate */ g_print ("Running...\n"); g_main_loop_run (loop); /* Out of the main loop, clean up nicely */ g_print ("Returned, stopping playback\n"); gst_element_set_state (pipeline, GST_STATE_NULL); g_print ("Deleting pipeline\n"); gst_object_unref (GST_OBJECT (pipeline)); return 0; } The error: Error: Erro no fluxo interno de dados. (something like "Error on internal data flow"). best regards, Katcipis </div> </div> <pre><hr size="4" width="90%"> ------------------------------------------------------------------------------ The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your production scanning environment may not be a perfect world - but thanks to Kodak, there's a perfect scanner to get the job done! 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