Hello, My code are always messy, and maybe you need to do some g_object_unref to clean(see the last line in comment), but this code works. A new pad callback function: static void cb_new_pad (GstElement *element,      GstPad     *pad,      gpointer    data) {   GstPad *sinkpad;   GstCaps *caps;   GstStructure *str;   gint i, max;     caps = gst_pad_get_caps (pad);     str = gst_caps_get_structure (caps, 0);   /* We can now link this pad with the audio or video  decoder */   g_print ("\n Dynamic pad created, linking parser/decoder \n");     if (g_strrstr (gst_structure_get_name (str), "video"))     {         g_print("Video link\n");                 max = gst_structure_n_fields (str); // Récupère le nombre de field dans la structure           for(i=0;i<max; i++){           g_print("\n Nom de la structure %s \n", gst_structure_nth_field_name (str, i)); // Recupère le nom de la structure.       }         g_print(gst_caps_to_string(caps));         //Add now the video thread in the main pipeline         gst_bin_add(GST_BIN(pipeline), pipeVideo);         //Put the pipeline video on state ready (It can bug if it is not init to ready)         gst_element_set_state (pipeVideo, GST_STATE_READY);         //Retrieves the sink pad of the pipevideo(the ghost pad)         sinkpad = gst_element_get_pad (pipeVideo, "sink");                //If the pileline is already link, stop here         if (GST_PAD_IS_LINKED (sinkpad)) return;        //You can add here a notify caps:         //g_signal_connect(sinkpad,    "notify::caps",G_CALLBACK(cb_notify_caps), NULL);         //Link the main pipeline pad with the pipeline video pad         if (gst_pad_link(pad, sinkpad)!= GST_PAD_LINK_OK)         {             g_error("Cannot link video\n");             return;         }         //Put the state at pause, it can be crash if not init         gst_element_set_state (pipeVideo, GST_STATE_PAUSED);     }   if ( g_strrstr (gst_structure_get_name (str), "audio"))     {         g_print("Audio link\n");                 gst_bin_add(GST_BIN(pipeline), pipeAudio);         gst_element_set_state (pipeAudio, GST_STATE_READY);         sinkpad = gst_element_get_pad (pipeAudio, "sink");         if (GST_PAD_IS_LINKED (sinkpad)){             g_print("Already link");         }                 if (gst_pad_link(pad, sinkpad) != GST_PAD_LINK_OK)         {             g_error("Cannot link audio\n");             return;         }         //g_print("Audio paused\n");     //    gst_element_set_state (pipeAudio, GST_STATE_PAUSED);     //    g_print("Audio playing\n");         //gst_element_set_state (pipeAudio, GST_STATE_PLAYING);     //    g_print("Video playing\n");     //    gst_element_set_state (pipeVideo, GST_STATE_PLAYING);         //g_print("pipe playing2\n")              if(!haveTypeAudio){              g_print("Type de l'audio pas encore trouvé %d \n", video_frames);              return;          };                 gst_element_set_state (pipeline, GST_STATE_PLAYING);       //gst_object_unref (sinkpad);          } } <div>2007/5/6, fabien <<a href="mailto:fabien.castan@free.fr"> fabien.castan@free.fr</a>>:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hello, It's me again. I tried and I tried by I still can't read a video file. So I tried to write the smallest and simplest code possible, based on the example that was sent to the mailing list. The only thing missing is the connection of the "pad" in the "cb_new_pad()" function and without this connection nothing can really happen.. I added the video pipeline to the global pipeline, but there must be something missing and I don't know what? I've attached the file to this e-mail. Thanks for your patience ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. <a href="http://sourceforge.net/powerbar/db2/"> http://sourceforge.net/powerbar/db2/</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div>