<html> <head> <style> .hmmessage P { margin:0px; padding:0px } body.hmmessage { FONT-SIZE: 9pt; FONT-FAMILY:Tahoma } </style> </head> <body class='hmmessage'>Hi,         I met some movies(like *.mkv and *.avi files) which include multi audio tracks and then my application can not switch audio when playback.       I tried to just unlink the demuxer and the audio decoder and then called gst-element-get-pad() to get another audio pad which will be linked to the audio decoder that is able to decode the audio. But I can not hear anything. The code looks like following   GstPad *src_pad, *sink_pad, *demux_src;    FAIL_CHECK (NULL == (demux_src = gst_element_get_pad(demuxer,"audio_01")));//Get anotherdemuxer source pad FAIL_CHECK (NULL == (sink_pad = gst_element_get_pad(a_decoder, "sink")));// Get audio decoder sink pad   src_pad = gst_pad_get_peer(sink_pad);//get the audio pad connected to decoder sink pad gst_element_set_state(player_status->bin, GST_STATE_PAUSED);  gst_pad_unlink (src_pad, sink_pad); gst_pad_link(demux_src, sink_pad); gst_object_unref(src_pad);   gst_object_unref(sink_pad); gst_object_unref(demux_src); gst_element_set_state(player_status->bin, GST_STATE_PLAYING); //End   It seems that does not work well. Does anyone have the idea about this?   Thanks a lot     <hr />MSN上小游戏，工作休闲两不误！ <a href='http://im.live.cn/minigame' target='_new'>马上就开始玩！</a></body> </html>