Hello, I develop an application for blind people. They hear much better than the average and are able to listen to higher playback rates for speech. I tried the sample Application from the documentation and wanted to change the rate. So I called gboolean b = gst_element_seek (pipeline, 2.0, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH, GST_SEEK_TYPE_SET, 0, GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE); b is true, but the playback rate is still the same. I read something that the decoder must support this kind of operation, but that vorbis should be able to do it. I do this before calling g_main_loop_run (loop); There is a plugin called scaletempo to remove the higher pitch. Where do I have to include that? Simply after the decoder? Thanks for your help, Bastian Hecht