Hi I try to use ffmpeg plugin to play wma music file and it works. See my code. But at the end of stream, it gives a error message: internal data stream error. I don't know why. Can you help me? Thank you! gcc -Wall `pkg-config --cflags --libs gstreamer-0.10` player.c -o player #include <gst/gst.h> GstElement *pipeline, *source, *parser, *decoder, *conv, *sink; static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data) {   GMainLoop *loop = data;   switch (GST_MESSAGE_TYPE (msg))   {     case GST_MESSAGE_EOS:       g_print ("End-of-stream\n");       g_main_loop_quit (loop);       break;     case GST_MESSAGE_ERROR:    {       gchar *debug;       GError *err;       gst_message_parse_error (msg, &err, &debug);       g_free (debug);       g_print ("Error: %s\n", err->message);       g_error_free (err);       g_main_loop_quit (loop);       break;     }     default:       break;   }   return TRUE; } static void new_pad (GstElement *element, GstPad *pad, gpointer data) {   GstPad *sinkpad;   g_print ("Dynamic pad created, linking parser/decoder\n");   sinkpad = gst_element_get_pad (decoder, "sink");   gst_pad_link (pad, sinkpad);   gst_object_unref (sinkpad); } int main (int   argc, char *argv[]) {   GMainLoop *loop;   GstBus *bus;   /* initialize GStreamer */   gst_init (&argc, &argv);   loop = g_main_loop_new (NULL, FALSE);   /* check input arguments */   if (argc != 2) {     g_print ("Usage: %s <wma filename>\n", argv[0]);     return -1;   }   /* create elements */   pipeline = gst_pipeline_new ("audio-player");   source = gst_element_factory_make ("filesrc", "file-source");   parser = gst_element_factory_make ("ffdemux_asf", "asf-parser");   decoder = gst_element_factory_make ("ffdec_wmav2", "wmav2-decoder");   conv = gst_element_factory_make ("audioconvert", "converter");   sink = gst_element_factory_make ("alsasink", "alsa-output");   if (!pipeline || !source || !parser || !decoder || !conv || !sink) {     g_print ("One element could not be created\n");     return -1;   }   g_object_set (G_OBJECT (source), "location", argv[1], NULL);   bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));   gst_bus_add_watch (bus, bus_call, loop);   gst_object_unref (bus);   gst_bin_add_many (GST_BIN (pipeline),       source, parser, decoder, conv, sink, NULL);   gst_element_link (source, parser);   gst_element_link_many (decoder, conv, sink, NULL);   g_signal_connect (parser, "pad-added", G_CALLBACK (new_pad), NULL);   g_print ("Setting to PLAYING\n");   gst_element_set_state (pipeline, GST_STATE_PLAYING);   g_print ("Running\n");   g_main_loop_run (loop);   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; }