Hello, I suggest you to remove variable start and duration attributes and put fixed values instead in order to have a clear schedule of the different elements involved. Moreover, the priority of the operation should be always minor that the videos involved, I suggest you to put a 0 always in the transition operation priority. Best Regards, Angel <div class="gmail_quote">2011/9/25 Rossana Guerra <<a href="mailto:guerra.rossana@gmail.com">guerra.rossana@gmail.com</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hello everyone, I am trying to do crossfade between 3 videos. It works fine when I do the same with 2, but when I put the 3rd something happens and the player displays only the first. Actually I use 2 videos, and I did a playlist such video1 -> video2 -> video2, where the 3rd time, I set the new starting time of the video2 object. video1 starts at 0, and its durations is dur1 I use an operator to handle the alpha channel, it starts at dur1 - dur_crossfade video2, starts at dur1 - dur_crossfade And the starting time of video 2 the third time is dur1 + dur2 - dur_crossfade. Maybe it's something wrong with the priority or start properties values, I am very new with GStreamer, I could make several mistakes. Thanks and regards, Rossana Here's the code: const gint dur_crossfade = 500; // Error handler static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data) { ::::::::::::::::::::::::::::::::: return TRUE; } static void on_pad_added (GstElement *element, GstPad *pad, gpointer data) { GstPad *sinkpad = NULL; GstElement * queue = (GstElement *) data; /* Ahora linkeo el pad de comp con sink pad */ g_print ("Dynamic pad created, linking queue\n"); sinkpad = gst_element_get_static_pad (queue, "sink"); gst_pad_link (pad, sinkpad); gst_object_unref (sinkpad); } GstElement * getBin(const gchar * nomBin, GstElement * &alfa1, GstElement *&smpte, GstElement * &color, gint transicion = 1) { GstElement * bin = gst_bin_new(nomBin); if (!bin) { g_printerr ("No se pudo crear el bin. Saliendo\n"); return NULL; } alfa1 = gst_element_factory_make ("alpha","alfa1"); smpte = gst_element_factory_make ("smptealpha","smpte"); color = gst_element_factory_make ("ffmpegcolorspace", "color"); GstElement * mixer = gst_element_factory_make("videomixer", "mixer"); if ((!alfa1) || (!smpte) || (!color) || (!mixer)) { g_printerr ("Alguno de los elementos del Bin no pudo ser creado. Saliendo\n"); return NULL; } // Anexamos al bin gst_bin_add_many(GST_BIN (bin),alfa1,smpte,mixer,color,NULL); // Enlazamos elementos gst_element_link (alfa1, mixer); gst_element_link (smpte, mixer); gst_element_link (mixer,color); g_object_set(smpte,"type", transicion, NULL); return bin; } void getAndSetController(GstElement * smpte, gdouble duracion) { GstController * ctrl = NULL; if (!(ctrl = gst_controller_new (G_OBJECT (smpte), "alpha",NULL))) { GST_WARNING ("No puede controlar el elemento fuente\n"); return; } // Todo valor GValue debe inicializarse en 0 GValue val_double = { 0, }; g_value_init (&val_double, G_TYPE_DOUBLE); // Create de controller, source and set the interpolation mode GstInterpolationControlSource * csource = gst_interpolation_control_source_new(); gst_controller_set_control_source (ctrl, "alpha", GST_CONTROL_SOURCE (csource)); gst_interpolation_control_source_set_interpolation_mode(csource,GST_INTERPOLATE_LINEAR); // Set first value g_value_set_double(&val_double, 0.0); gst_interpolation_control_source_set(csource,(0 * GST_MSECOND),&val_double); // Ser 2nd value g_value_set_double (&val_double, duracion); gst_interpolation_control_source_set(csource,(1 * GST_MSECOND),&val_double); g_object_unref (csource); } void addGhostPadsToBin(GstElement *alfa1, GstElement * smpte, GstElement * color, GstElement* bin) { /* add ghostpad */ GstPad * pad1 = gst_element_get_static_pad (alfa1, "sink"); gst_element_add_pad(bin, gst_ghost_pad_new("alfasink1", pad1)); gst_object_unref (GST_OBJECT (pad1)); GstPad * pad2 = gst_element_get_static_pad (smpte, "sink"); gst_element_add_pad(bin, gst_ghost_pad_new("alfasink2", pad2)); gst_object_unref(GST_OBJECT(pad2)); GstPad * pad3 = gst_element_get_static_pad (color, "src"); gst_element_add_pad(bin, gst_ghost_pad_new("colorsrc", pad3)); gst_object_unref(GST_OBJECT(pad3)); } void crossTransicion(gdouble duracion, GstElement * & bin,gint transicion = 1) { // devuelve el bin GstElement * alfa1, *smpte, *color; alfa1 = 0; smpte = 0; color = 0; bin = getBin("bin",alfa1, smpte,color,transicion); // Crea el bin y los elementos getAndSetController(smpte,duracion); addGhostPadsToBin(alfa1, smpte, color, bin); } GstElement * crearVideo(const gchar *nomVideo, GstElement *&comp) { GstElement* video = NULL; if ((video = gst_element_factory_make("gnlfilesource", nomVideo)) == NULL) { printf ("\n Falló la creacion del gnlfilesource \n"); return NULL; } if (gst_bin_add (GST_BIN (comp), video) == FALSE) { printf ("\n No pudo agregar video %s a comp \n", nomVideo); return NULL; } return video; } void crearCompYoper(GstElement*& compo, GstElement *&op, GstElement*& bin2) { if ((compo = gst_element_factory_make("gnlcomposition", "micomposicion")) == NULL) { printf ("\n Fallo al crear gnlcomposition \n"); return; } //Aqui se crea el bin crossTransicion(dur_crossfade, bin2,1); op = gst_element_factory_make("gnloperation", "op"); if (gst_bin_add (GST_BIN (op), bin2) == FALSE) { printf ("\n No pudo agregar el bin a la gnloperacion op \n"); return; } if (gst_bin_add (GST_BIN (compo), op) == FALSE) { printf ("\n No pudo agregar la gnloperacion a la gnlcomposition \n"); return; } } /// Aqui pipeline3 GstElement * getPipeline3(gchar *argv[],GstElement *&video1, gint dur1, GstElement *& video2,GstElement *& comp, GstElement *&op) { GstElement *queue, *sink, *pipeline, *bin; crearCompYoper(comp, op,bin); video1 = crearVideo("video1",comp); video2 = crearVideo("video2",comp); g_object_set (video1, "location", argv[1], NULL); g_object_set(video1, "uri", argv[1],NULL); g_object_set (video1, "start", 0 * GST_MSECOND, NULL); g_object_set (video1, "duration", dur1 * GST_MSECOND, NULL); g_object_set (video1, "media-start", 0* GST_MSECOND, NULL); g_object_set (video1, "media-duration", dur1 * GST_MSECOND, NULL); g_object_set (video1, "priority", 1,NULL); // setup the backend viewer queue = gst_element_factory_make("queue", "queue"); sink = gst_element_factory_make("autovideosink", "sink"); pipeline = gst_pipeline_new ("video-player"); /* Agrego elementos al pipeline */ gst_bin_add_many (GST_BIN (pipeline),comp, queue, sink, NULL); g_signal_connect (comp, "pad-added", G_CALLBACK (on_pad_added),queue); gst_element_link (queue, sink); cout << "...PLAY" << endl; gst_element_set_state (pipeline, GST_STATE_PLAYING); return pipeline; } void playSigVideo(gchar *argv[], GstElement *& video2, gint dur1, gint dur2,GstElement *&op, GstElement *pip) { g_object_set (op,"start", (dur1-dur_crossfade) * GST_MSECOND,NULL); g_object_set (op,"duration", dur_crossfade * GST_MSECOND,NULL); g_object_set (op,"media-start", 0 * GST_MSECOND,NULL); g_object_set(op,"media-duration", dur_crossfade * GST_MSECOND,NULL); g_object_set(op,"priority",0,NULL); gst_element_set_state (pip, GST_STATE_PLAYING); g_object_set (video2, "location", argv[2], NULL); g_object_set (video2,"uri",argv[2],NULL); g_object_set (video2, "start", (dur1-dur_crossfade) * GST_MSECOND, NULL); g_object_set (video2, "duration", dur2 * GST_MSECOND, NULL); g_object_set (video2, "media-start", 0 * GST_MSECOND, NULL); g_object_set (video2, "media-duration", dur2 * GST_MSECOND, NULL); g_object_set (video2, "priority", 2,NULL); g_object_set (op,"start", ((dur2+dur1)- 2*dur_crossfade) * GST_MSECOND,NULL); g_object_set (op,"duration", dur_crossfade * GST_MSECOND,NULL); g_object_set (op,"media-start", 0 * GST_MSECOND,NULL); g_object_set(op,"media-duration", dur_crossfade * GST_MSECOND,NULL); g_object_set(op,"priority",3,NULL); g_object_set (video2, "location", argv[1], NULL); g_object_set (video2,"uri",argv[1],NULL); g_object_set (video2, "start", ((dur2 + dur1) - 2*dur_crossfade) * GST_MSECOND, NULL); g_object_set (video2, "duration", dur1 * GST_MSECOND, NULL); g_object_set (video2, "media-start", 0 * GST_MSECOND, NULL); g_object_set (video2, "media-duration", dur1 * GST_MSECOND, NULL); g_object_set (video2, "priority", 4,NULL); } int main(gint argc, gchar *argv[]) { gint dur1 = 9000; // d uration (in ms) to play of first clip gint dur2 = 8000; // duration (in ms) to play of second clip //gint dur_crossfade = 500; //number of milliseconds to crossfade for GMainLoop *loop = NULL; /* init GStreamer */ gst_init (&argc, &argv); gst_controller_init (&argc, &argv); loop = g_main_loop_new (NULL, FALSE); /* chequeamos sintaxis */ if (argc != 3) { g_print ("Uso: %s <URI1> <URI2>\n", argv[0]); return -1; } GstElement *comp = NULL; GstElement *op = NULL; GstElement *video1,*video2; GstElement *play = getPipeline3(argv,video1, dur1,video2,comp, op); playSigVideo(argv,video2, dur1, dur2,op,play); GstBus *bus2 = gst_pipeline_get_bus (GST_PIPELINE (play)); gst_bus_add_watch (bus2, bus_call, loop); gst_object_unref (bus2); //cout << "...PLAY" << endl; /* now run */ g_main_loop_run (loop); /* also clean up */ gst_element_set_state (play, GST_STATE_NULL); gst_object_unref (GST_OBJECT (play)); return 0; } _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div>