Hi,   I'm able to play the wav file by using gst-launch as fallows gst-launch-0.10  filesrc location=~/songs/4voice.wav ! wavparse ! audioconvert ! alsasink Setting pipeline to PAUSED ... Pipeline is PREROLLING ... Pipeline is PREROLLED ... Setting pipeline to PLAYING ... New clock: GstAudioSinkClock Caught interrupt -- handling interrupt. Interrupt: Setting pipeline to PAUSED ... Execution ended after 1914601000 ns. Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... FREEING pipeline ... I modified the helloworld code to play the wav as 1. I created "waveparse" in place of oggdemux and vorbis  parser elements 2. Added filesrc, waveparse and alsasink to the pipeline and linked. -- int main ( int argc, char *argv[] ) {         GMainLoop *loop;         GstBus *bus;         gst_init ( &argc, &argv );         loop = g_main_loop_new ( NULL, FALSE );          pipeline = gst_pipeline_new ( "audio-player" );         source = gst_element_factory_make ( "filesrc", "file-source" );         //parser = gst_element_factory_make ( "oggdemux", "ogg-parser" );         parser = gst_element_factory_make ( "wavparse", "wave-parser" );         //decoder = gst_element_factory_make ( "vorbisdec", "vorbis-decoder" );         conv = gst_element_factory_make ( "audioconvert", "converter" );         sink = gst_element_factory_make ( "alsasink", "alsa-output" );         if ( !pipeline || !source || !parser || !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,                            conv, sink, NULL );         //gst_element_link ( source, parser );         gst_element_link_many ( source, parser, 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; } -- When i tried to run the fallowing code, i'm getting fallowing errors -- ./a.out ~/songs/4voice.wav Setting to Playing Running Dynamic pad created, linking parser/decoder (a.out:20136): GStreamer-CRITICAL **: gst_element_get_static_pad: assertion `GST_IS_ELEMENT (element)' failed (a.out:20136): GStreamer-CRITICAL **: gst_pad_link_prepare: assertion `GST_IS_PAD (sinkpad)' failed (a.out:20136): GStreamer-CRITICAL **: gst_object_unref: assertion `object != NULL' failed Error: Internal data flow error. Returned, stopping playback Deleting pipeline -- If i do without the dynamic pads, as -- int main (int argc, char *argv[]) {   GstElement *bin, *filesrc, *decoder, *audiosink;   GstElement *conv, *resample;   gst_init (&argc, &argv);   if (argc != 2) {     g_print ("usage: %s <mp3 file>\n", argv[0]);     exit (-1);   }   /* create a new bin to hold the elements */   bin = gst_pipeline_new ("pipeline");   g_assert (bin);   /* create a disk reader */   filesrc = gst_element_factory_make ("filesrc", "disk_source");   g_assert (filesrc);   g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);   /* now it's time to get the decoder */   decoder = gst_element_factory_make ("wavparse", "decode");   if (!decoder) {     g_print ("could not find plugin \"mad\"");     return -1;   }   /* also, we need to add some converters to make sure the audio stream    * from the decoder is converted into a format the audio sink can    * understand (if necessary) */   conv = gst_element_factory_make ("audioconvert", "audioconvert");   if (!conv) {     g_print ("could not create \"audioconvert\" element!");     return -1;   }   resample = gst_element_factory_make ("audioresample", "audioresample");   if (!conv) {     g_print ("could not create \"audioresample\" element!");     return -1;   }   /* and an audio sink */   audiosink = gst_element_factory_make ("alsasink", "play_audio");   g_assert (audiosink);   /* add objects to the main pipeline */   gst_bin_add_many (GST_BIN (bin), filesrc, decoder, conv,       resample, audiosink, NULL);   /* link the elements */   gst_element_link_many (filesrc, decoder, conv, resample, audiosink, NULL);   g_signal_connect ( decoder, "pad-added", G_CALLBACK (new_pad), NULL );   /* start playing */   gst_element_set_state (bin, GST_STATE_PLAYING);   /* Run event loop listening for bus messages until EOS or ERROR */   event_loop (bin);   /* stop the bin */   gst_element_set_state (bin, GST_STATE_NULL);   exit (0); } I'm getting -- ./a.out ~/songs/4voice.wav Dynamic pad created, linking parser/decoder ERROR: from element /pipeline/decode: Internal data flow error. Additional debug info: gstwavparse.c(1719): gst_wavparse_loop (): /pipeline/decode: streaming task paused, reason not-linked (-1) -- It would be of great help if somebody look into this. /Ganesh