This looks like a wav file based behavior, for few wav files, mpegaudioparse , ffdec_mp3 is used.<div>I have attached the wav file for this can be reproduced. --vineeth <div class="gmail_quote">On Wed, Mar 16, 2011 at 4:16 PM, vineeth <<a href="mailto:nvineeth@gmail.com">nvineeth@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> Hi, I was trying the test4.c example in gstreamer-editing-services-0.10.1/tests/examples , which is used to append one or more audio media files into a ogg file. I was surprised to see that trying to combine wav files into a ogg file was using mpegaudioparse and mp3 decoder. May be this is a bug and this can be improved., can somebody pls clarify on this. The relevant command is : ./test4 file:///home/user/wav.ogg /mnt/hgfs/ubuntu_shared/streams/Windows\ Default.wav The generated ogg file is fine, however I think the pipeline can be optimized. I have attached the logs with GST_DEBUG=3 Thanks, --vineeth </blockquote></div> </div>