fakesink vs autovideosink in gstreamer pipeline

[rtvideo]

I want co change fakesink (the last part of the pipeline) to autovideosink to produce a gstreamer pop up, but when I do so I get errors which I am assuming that are related to

   g_object_get (data->sink, "last-sample", &from_sample, NULL); 

and the gst_video_convert_sample. Any suggestions on how to implement autovideosink without getting errors?

int main(int argc, char *argv[]) {

  CustomData data;
  GstBus *bus;
  GstMessage *msg;
  GstStateChangeReturn ret;

  data.terminate = FALSE;

  /* Initialize GStreamer */
  gst_init (&argc, &argv);

  /* Create the elements */
  data.pipeline = gst_parse_launch ("v4l2src device=/dev/video0 ! videoconvert ! videoscale ! "
             "video/x-raw,framerate=30/1,width=2592,height=600 ! fakesink enable-last-sample=true name=sink ", NULL);


  data.sink = gst_bin_get_by_name( GST_BIN( data.pipeline), "sink");

  if (!data.pipeline) {
    g_printerr ("Not all elements could be created.\n");
    return -1;
  }

/* Start playing */
  ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
    if (ret == GST_STATE_CHANGE_FAILURE) {
      g_printerr ("Unable to set the pipeline to the playing state.\n");
      gst_object_unref (data.pipeline);
      return -1;
    }

    /* Listen to the bus */
    bus = gst_element_get_bus (data.pipeline);
    do {

      msg = gst_bus_timed_pop_filtered (bus, 2 * GST_SECOND,(GstMessageType)(GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
      /* Parse message */
      if (msg != NULL) {
        handle_message (&data, msg);
      }else {
        g_print ("\nCapturing image\n");
        send_trigger();

        process a;
        a.take_pic (&data);
      }
    } while (!data.terminate);

    /* Free resources */
    gst_object_unref (bus);
    gst_element_set_state (data.pipeline, GST_STATE_NULL);
    gst_object_unref (data.pipeline);
    return 0;
  }

static void handle_message (CustomData *data, GstMessage *msg) {
GError *err;
gchar *debug_info;

switch (GST_MESSAGE_TYPE (msg)) {
  case GST_MESSAGE_ERROR:
    gst_message_parse_error (msg, &err, &debug_info);
    g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message);
    g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none");
    g_clear_error (&err);
    g_free (debug_info);
          data->terminate = TRUE;
          break;
        case GST_MESSAGE_EOS:
          g_print ("End-Of-Stream reached.\n");
          data->terminate = TRUE;
          break;
        case GST_MESSAGE_STATE_CHANGED:{
          GstState old_state, new_state, pending_state;
          gst_message_parse_state_changed (msg, &old_state, &new_state, &pending_state);
          g_print ("%s state changed from %s to %s:\n", GST_OBJECT_NAME (GST_MESSAGE_SRC (msg)),
               gst_element_state_get_name (old_state), gst_element_state_get_name (new_state));
          } break;
        default:
          /* We should not reach here */
          g_printerr ("Unexpected message received.\n");
          break;
      }
      gst_message_unref (msg);
    }



void process::take_pic(CustomData *data)
{
    GstCaps *caps;
    GstSample *from_sample, *to_sample;
    GError *err = NULL;
    GstBuffer *buf;
    GstMapInfo map_info;

    data->terminate = TRUE;

    g_object_get (data->sink, "last-sample", &from_sample, NULL); 
    if (from_sample == NULL) {

        GST_ERROR ("Error getting last sample form sink");
        return;
    }

    caps = gst_caps_from_string ("image/bmp");
    to_sample = gst_video_convert_sample (from_sample, caps, GST_CLOCK_TIME_NONE, &err);
    gst_caps_unref (caps);
    gst_sample_unref (from_sample);

    if (to_sample == NULL && err) {
        GST_ERROR ("Error converting frame: %s", err->message);
        g_error_free (err);
        return;
    }


    buf = gst_sample_get_buffer (to_sample);
    if (gst_buffer_map (buf, &map_info, GST_MAP_READ)) {
        
        if (!g_file_set_contents (PIC_LOCATION, (const char *) map_info.data,
                                  100000, &err)) {
            GST_WARNING ("Could not save thumbnail: %s", err->message);
            g_error_free (err);
        }
    }

    //This line will cause error
    //gst_sample_unref (to_sample);
    gst_buffer_unmap (buf, &map_info);
}

[SGaist]

Hi,

Shouldn't you rather post that on the GStreamer forum ?