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Crossfade - Resource not found message at runtime

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rossana
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Crossfade - Resource not found message at runtime

rossana
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;
}




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amartin
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Re: Crossfade - Resource not found message at runtime

amartin
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 <[hidden email]>
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;
}




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rossana
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Re: Crossfade - Resource not found message at runtime

rossana
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 <[hidden email]>
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 <[hidden email]>
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;
}




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Nicolai Hess
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Re: Crossfade - Resource not found message at runtime

Nicolai Hess
Hi Rossane,
your code is working for me.
Remember to use an URI for your input file arguments, example:

nameofyourprogram file://<path_to_file1> file://<path_to_file2>

2011/9/7 Rossana Guerra <[hidden email]>
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 <[hidden email]>
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 <[hidden email]>
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;
}




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-- 
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: <a href="tel:%2B%5B34%5D%20943%2030%2092%2030" value="+34943309230" target="_blank">+[34] 943 30 92 30
Fax: <a href="tel:%2B%5B34%5D%20943%2030%2093%2093" value="+34943309393" target="_blank">+[34] 943 30 93 93


e-mail: [hidden email]

www.vicomtech.org

*** member of IK4 Research Alliance ****
www.ik4.es
*** member of GraphicsMedia.net ****



www.graphicsmedia.net



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rossana
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Re: Crossfade - Resource not found message at runtime

rossana
Hi Nicolai, does the crossfade work?.
Actually this is the syntax of the command (from console)

./crossfade file:///video1.avi file:///video2.avi

crossfade : name of the programm

I intended the uri format in several ways (according to URI specification), though noneone works, the same error. "Resource not found",

file:///video1.avi
file://video1.avi
file:/video1.avi

In the last 2 format the message says, resource for reading not found.

Thanks for your help

Rossana


2011/9/7 Nicolai Hess <[hidden email]>
Hi Rossane,
your code is working for me.
Remember to use an URI for your input file arguments, example:

nameofyourprogram file://<path_to_file1> file://<path_to_file2>

2011/9/7 Rossana Guerra <[hidden email]>
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 <[hidden email]>
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 <[hidden email]>
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
[hidden email]
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-- 
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: <a href="tel:%2B%5B34%5D%20943%2030%2092%2030" value="+34943309230" target="_blank">+[34] 943 30 92 30
Fax: <a href="tel:%2B%5B34%5D%20943%2030%2093%2093" value="+34943309393" target="_blank">+[34] 943 30 93 93



e-mail: [hidden email]

www.vicomtech.org

*** member of IK4 Research Alliance ****
www.ik4.es
*** member of GraphicsMedia.net ****




www.graphicsmedia.net



-----------------------------------------------------
Vicomtech is an ISO 9001:2000 certified institute
-----------------------------------------------------





Este mensaje se dirige exclusivamente a su destinatario. 
La información incluida en el presente correo es confidencial sometida a 
secreto profesional, especialmente en lo que respecta a los datos de 
carácter personal, cuya divulgación está prohibida, en virtud de la 




legislación vigente. Si usted no es el destinatario legítimo y lo ha 
recibido por error o tiene conocimiento del mismo por cualquier motivo, 
le rogamos que nos lo comunique por este medio y proceda a destruirlo o 




borrarlo. En todo caso abstengase de utilizar, reproducir, alterar, 
archivar o comunicar a terceros el presente mensaje así como los ficheros 
anexos, todo ello bajo pena de incurrir en responsabilidades legales. 




Cualquier opinión contenida en este correo es exclusiva de su autor y no 
representa necesariamente la opinión de ASOCIACIÓN CENTRO DE TECNOLOGÍAS 
DE INTERACCIÓN VISUAL Y COMUNICACIONES VICOMTECH (en adelante Vicomtech-IK4) 




El emisor no garantiza la integridad, rapidez o seguridad del presente correo, 
ni se responsabiliza de posibles perjuicios derivados de la captura, 
incorporaciones de virus o cualesquiera otras manipulaciones efectuadas por terceros.




Con motivo de la entrada en vigor de la Ley 34/2002, de 11 de julio, de 
Servicios de la Sociedad de la Información y de Comercio Electrónico, le 
informamos que pueden revocar en cualquier momento, de forma sencilla y gratuita, 




el consentimiento para la recepción de mensajes de vicomtech.org en [hidden email].


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Nicolai Hess
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Re: Crossfade - Resource not found message at runtime

Nicolai Hess
you need the full path of your video files, for example

file:///home/nicolai/video1.avi

2011/9/7 Rossana Guerra <[hidden email]>
Hi Nicolai, does the crossfade work?.
Actually this is the syntax of the command (from console)

./crossfade file:///video1.avi file:///video2.avi

crossfade : name of the programm

I intended the uri format in several ways (according to URI specification), though noneone works, the same error. "Resource not found",

file:///video1.avi
file://video1.avi
file:/video1.avi

In the last 2 format the message says, resource for reading not found.

Thanks for your help

Rossana



2011/9/7 Nicolai Hess <[hidden email]>
Hi Rossane,
your code is working for me.
Remember to use an URI for your input file arguments, example:

nameofyourprogram file://<path_to_file1> file://<path_to_file2>

2011/9/7 Rossana Guerra <[hidden email]>
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 <[hidden email]>
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 <[hidden email]>
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;
}




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-- 
Ángel Martín Navas
Investigador / Researcher
Televisión Digital y Servicios Multimedia / Digital TV & Multimedia Services

Vicomtech - Visual Interaction Communication Technologies





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