GStreamer C Code to play video

Durga durgas1987 at
Wed Aug 3 03:55:01 PDT 2011


I have identified the below pipleine to play the video. 

gst-launch-0.10 -v filesrc location=/home/administrator/Desktop/Test.mp4 !
qtdemux ! ffdec_mpeg4 ! autovideosink 

With gst-launch i am able to play the video. 

I converted the pipeline to a C Code and tried to play the video but it
displays the error:GStreamer General Stream Error.

This is code i am using for testing.


#include <gst/gst.h>
#include <glib.h>

static gboolean
bus_call (GstBus *bus, GstMessage *msg, gpointer data)
  GMainLoop *loop = (GMainLoop *) data;

  switch (GST_MESSAGE_TYPE (msg)) {

      g_print ("End of stream\n");
      g_main_loop_quit (loop);

      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);

  return TRUE;

main (int argc, char *argv[])
  GMainLoop *loop;

  GstElement *pipeline, *videosrc, *colorspace, *videoenc,
    *videoq, *audiosrc, *conv, *audioenc, *audioq, *muxer, *sink;

  GstBus *bus;

  /* Initialisation */
  gst_init ((NULL, NULL);

  loop = g_main_loop_new (NULL, FALSE);

  /* Create gstreamer elements */
  pipeline = gst_pipeline_new ("audio-player");
  videosrc = gst_element_factory_make ("filesrc", "videosrc");
  muxer = gst_element_factory_make ("qtdemux", "mux");
  videoenc = gst_element_factory_make ("ffdec_mpeg4", "videoenc");
  sink = gst_element_factory_make ("autovideosink", "sink");

  if (!pipeline || !videosrc || !muxer || !videoenc
       || !sink) {
    g_printerr ("One element could not be created. Exiting.\n");
    return -1;

  /* Set up the pipeline */
  g_print ("Elements are created\n");

  /* set the properties of other elements */
  g_object_set (G_OBJECT (videosrc), "location",
"/home/administrator/Desktop/Test.mp4", NULL);

  /* we add a message handler */
  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
  gst_bus_add_watch (bus, bus_call, loop);
  gst_object_unref (bus);

  /* we add all elements into the pipeline */
  gst_bin_add_many (GST_BIN (pipeline),
    videosrc, muxer, videoenc,  
    sink, NULL);

  g_print ("Added all the Elements into the pipeline\n");

  /* we link the elements together */
  gst_element_link_many (videosrc, muxer, videoenc, sink,

  g_print ("Linked all the Elements together\n");
  /* Set the pipeline to "playing" state*/
  g_print ("Playing the video\n");
  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  /* Iterate */
  g_print ("Running...\n");
  g_main_loop_run (loop);

  /* Out of the main loop, clean up nicely */
  g_print ("Returned, stopping playback\n");
  gst_element_set_state (pipeline, GST_STATE_NULL);

  g_print ("Deleting pipeline\n");
  gst_object_unref (GST_OBJECT (pipeline));

  return 0;

Please let me know if  there is any error in the code.

Thanks in advance.

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