Crossfade - Resource not found message at runtime
Rossana Guerra
guerra.rossana at gmail.com
Wed Sep 7 11:53:03 PDT 2011
Hi Angel, the path is correct. In fact I use the same path to another
example.
Can you please tell me what kind of bug is? I can't realize.
Thanks for your response
2011/9/7 Angel Martin <amartin at vicomtech.org>
> Dear Rossana,
>
> I think that this kind of error message is obtained when the video resource
> is not found so check the file path to the files and be sure that the paths
> are right in the location assignment of each gnlfilesource.
>
> Moreover, You have a bug in the getAndSetController concerning the duration
> of the transition:
>
> g_value_set_double (&val_double, 1.0);
> gst_interpolation_control_source_set(csource,(duracion *
> GST_MSECOND),&val_double);
>
> Best,
>
> Angel
>
> 2011/9/7 Rossana Guerra <guerra.rossana at gmail.com>
>
>> Hi all, I am totally new with GSteamer, so sorry for the lots of mistakes
>> I have. I am trying to do the example of this link in C/C++
>> http://notes.brooks.nu/gstreamer-video-crossfade-example/
>> It's about crossfade. I doing it with .AVI files.
>>
>> At runtime I got the Resource not found error. Another examples, like a
>> playbin, work properly with .AVI's, so I don't think is a codec issue.
>> The video files are passing as arguments (uri format).
>>
>> Thanks in advance.
>>
>> /////////////////////////
>> Heres the code
>>
>>
>> #include <gst.h>
>> #include <controller/gstcontroller.h>
>>
>> #include <iostream>
>>
>> using namespace std;
>>
>> // Error handler
>> 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 ("Final de 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:
>> break;
>> }
>> return TRUE;
>> }
>>
>> static void on_pad_added (GstElement *element, GstPad *pad, gpointer
>> data)
>> {
>> GstPad *sinkpad;
>> GstElement * queue = (GstElement *) data;
>>
>> /* We can now link this pad with the vorbis-decoder sink pad */
>> g_print ("Dynamic pad created, linking demuxer/decoder\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
>> *&alfa2, GstElement * &color)
>> {
>>
>> 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");
>> alfa2 = gst_element_factory_make ("alpha","alfa2");
>> color = gst_element_factory_make ("ffmpegcolorspace", "color");
>> GstElement * mixer = gst_element_factory_make("videomixer", "mixer");
>>
>> if ((!alfa1) || (!alfa2) || (!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,alfa2,mixer,color,NULL);
>>
>> // Enlazamos elementos
>> gst_element_link (alfa1, mixer);
>> gst_element_link (alfa2, mixer);
>> gst_element_link (mixer,color);
>>
>> return bin;
>> }
>>
>> void getAndSetController(GstElement * alfa2, gdouble duracion)
>> {
>> GstController * ctrl = NULL;
>> if (!(ctrl = gst_controller_new (G_OBJECT (alfa2), "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);
>>
>>
>> // Seteo los valores de control del alfa2
>>
>> 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);
>>
>>
>> g_value_set_double(&val_double, 0.0);
>> gst_interpolation_control_source_set(csource,(0*
>> GST_MSECOND),&val_double);
>>
>> 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 * alfa2, 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 (alfa2, "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 crossFade(gdouble duracion, GstElement * & bin)
>> {
>> // devuelve el bin
>> GstElement * alfa1, *alfa2, *color;
>> alfa1 = 0;
>> alfa2 = 0;
>> color = 0;
>>
>> bin = getBin("bin",alfa1, alfa2,color); // Crea el bin y los
>> elementos
>>
>> getAndSetController(alfa2,duracion);
>>
>> addGhostPadsToBin(alfa1, alfa2, color, bin);
>>
>>
>> }
>>
>> GstElement * getSetPipeline(gchar *argv[])
>> {
>> gint dur1 = 9000; // duration (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
>> GstElement *comp = 0;
>> GstElement *pipeline, *video1, *video2, *op, *bin, *queue, *sink;
>>
>> //we play two clips serially with a crossfade between them
>> // using the gnonlin gnlcomposition element.
>> if ((comp = gst_element_factory_make("gnlcomposition",
>> "mycomposition")) == NULL)
>> {
>> printf ("\n Fallo al crear gnlcomposition \n");
>> return NULL;
>> }
>>
>> // setup first clip
>>
>> if ((video1 = gst_element_factory_make("gnlfilesource", "video1")) ==
>> NULL)
>> {
>> printf ("\n Falló la creacion del gnlfilesource \n");
>> return NULL;
>> }
>> if (gst_bin_add (GST_BIN (comp), video1) == FALSE)
>> {
>> printf ("\n No pudo agregar video1 a comp \n");
>> return NULL;
>> }
>>
>> g_object_set (video1, "location", 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);
>>
>> if ((video2 = gst_element_factory_make("gnlfilesource", "video2")) ==
>> NULL)
>> {
>> printf ("\n Falló la creacion del gnlfilesource \n");
>> return NULL;
>> }
>> if (gst_bin_add (GST_BIN (comp), video2) == FALSE)
>> {
>> printf ("\n No pudo agregar video2 a comp \n");
>> return NULL;
>> }
>>
>> // setup second clip
>> g_object_set (video2, "location", 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);
>>
>> // setup the crossfade
>> op = gst_element_factory_make("gnloperation", "op");
>>
>> crossFade(dur_crossfade, bin);
>>
>> if (gst_bin_add (GST_BIN (op), bin) == FALSE)
>> {
>> printf ("\n No pudo agregar el bin a la gnloperacion op \n");
>> return NULL;
>> }
>>
>> 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);
>>
>> if (gst_bin_add (GST_BIN (comp), op) == FALSE)
>> {
>> printf ("\n No pudo agregar la gnloperacion a la gnlcomposition
>> \n");
>> return 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 << "creó pipeline!!!" << endl;
>>
>> return pipeline;
>>
>> }
>>
>> void startPlay(GstElement * pip)
>> {
>> /* Set the pipeline to "playing" state*/
>> cout << "antes del PLAY" << endl;
>> gst_element_set_state (pip, GST_STATE_PLAYING);
>> cout << "dp del PLAY" << endl;
>>
>> }
>>
>>
>> int main(gint argc, gchar *argv[])
>> {
>> GMainLoop *loop = NULL;
>>
>> /* init GStreamer */
>> gst_init (&argc, &argv);
>> gst_controller_init (&argc, &argv);
>>
>>
>> loop = g_main_loop_new (NULL, FALSE);
>>
>> /* make sure we have a URI */
>> if (argc != 3)
>> {
>> g_print ("Uso: %s <URI1> <URI2>\n", argv[0]);
>> return -1;
>> }
>>
>> GstElement * play = getSetPipeline(argv);
>>
>> cout << "creo pipeline" << endl;
>>
>> GstBus *bus2 = gst_pipeline_get_bus (GST_PIPELINE (play));
>> gst_bus_add_watch (bus2, bus_call, loop);
>> gst_object_unref (bus2);
>>
>> cout << "start play" << endl;
>>
>> startPlay(play);
>>
>> /* 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
>> gstreamer-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
>
> --
>
> Ángel Martín Navas
> Investigador / Researcher
> Televisión Digital y Servicios Multimedia / Digital TV & Multimedia Services
>
> Vicomtech - Visual Interaction Communication Technologies
>
> Mikeletegi Pasealekua, 57 - Parque Tecnológico
> 20009 Donostia - San Sebastián - Spain
> Tel: +[34] 943 30 92 30
> Fax: +[34] 943 30 93 93
> e-mail: amartin at vicomtech.org
> www.vicomtech.org
>
> *** member of IK4 Research Alliance ****
> www.ik4.es
> *** member of GraphicsMedia.net ****
> www.graphicsmedia.net
>
>
>
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