hello_world.c

//>  gcc -o hello_world hello_world.c $(pkg-config --cflags --libs gstreamer-1.0)
#include </usr/include/gstreamer-1.0/gst/gst.h>

#ifdef __APPLE__
#include <TargetConditionals.h>
#endif

int
tutorial_main (int argc, char *argv[])
{
  GstElement *pipeline;
  GstBus *bus;
  GstMessage *msg;

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

  /* Build the pipeline */
  pipeline =
      gst_parse_launch
      ("playbin uri=https://gstreamer.freedesktop.org/data/media/sintel_trailer-480p.webm",
      NULL);
  //pipeline = gst_parse_launch ("v4l2src device=/dev/video0 ! videoconvert ! autovideosink", NULL);


  /* Start playing */
  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  /* Wait until error or EOS */
  bus = gst_element_get_bus (pipeline);
  msg =
      gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
      GST_MESSAGE_ERROR | GST_MESSAGE_EOS);

  /* See next tutorial for proper error message handling/parsing */
  if (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_ERROR) {
    g_error ("An error occurred! Re-run with the GST_DEBUG=*:WARN environment "
        "variable set for more details.");
  }

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

int
main (int argc, char *argv[])
{
#if defined(__APPLE__) && TARGET_OS_MAC && !TARGET_OS_IPHONE
  return gst_macos_main (tutorial_main, argc, argv, NULL);
#else
  return tutorial_main (argc, argv);
#endif
}