Hello Stephan, Sorry repeatedly asking the same querry. I am using fdsrc to read from some special file which is not a regular file , I mean not seekable file. Data expected to come on this special device. I have simulated non-seekable file using pipe & simply redirecting the o/p of cat on some mp3 file to this device file. My pipeline (fdsrc ! decodebin2 ! autoaudiosink) is reading from the fd of this device file & playing it correctly. I am not sure of how seeking is done for on this pipeline [since fdsrc's seek is segment based gst_fd_src_do_seek (GstBaseSrc * src, GstSegment * segment) ] However I am using seek in time units (I am not sure of segment seeking is required here or not) if(!(gst_element_seek (pipeline, 1.0, GST_FORMAT_TIME, GST_SEEK_FLAG_FLUSH, GST_SEEK_TYPE_SET, new_pos, GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE))) the seek is failing immediately (as expected since pipe is non-seekable) , however there is no playback happening for some time & I see "gst_fd_src_create" is being called multiple times by gstreamer & fdsrc->curoffset is updated & after some time normal playback is resumed , but now it plays from the new offset(due to seek), which is not expected , rather it should have been playing from the same offset as just before gst_element_seek is called. Your inputs are highly appreciated. -- Thanks & Regards, Satish Pattar