You can also build ADTS header and attach it with every frame, following link gives information about ADTS header;<div><a href="http://wiki.multimedia.cx/index.php?title=ADTS">http://wiki.multimedia.cx/index.php?title=ADTS</a> <div class="gmail_quote">On Mon, Mar 19, 2012 at 9:01 PM, Neil Jones <<a href="mailto:neiljay@gmail.com">neiljay@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Im trying to play MP4 files with my AAC Decoder but im having problems. the file im playing is 'cooper.mp4' from these samples <a href="http://www.mp3-tech.org/tests/aac_48/samples/sample6.zip" target="_blank">http://www.mp3-tech.org/tests/aac_48/samples/sample6.zip</a> this is a 48Khz LC-AAC with SBR (ie HE-AAC), looking a this with qtdemux and fakesink gives: gst-launch -vvv filesrc location=cooper.mp4 ! qtdemux ! fakesink | more .... caps = audio/mpeg, mpegversion=(int)4, framed=(boolean)true, stream-format=(string)raw, codec_data=(buffer)139056e5a0, rate=(int)44100, channels=(int)2 .... So as qtdemux gives us raw data (not adts or adif framed) I need to setup my decoder on the info provided by qtdemux, unfortunatley it gives me the wrong sample rate 44.1 instead of 48 and I need to know that the profile has SBR as this effects my decoder setup. How do other AAC decoders deal with this? Do they just parse the raw data, I cant easily do this as my plugin is for a hardware decoder. Any help appreciated, Cheers, Neil _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div> <div> </div>-- Regards, Sudarshan Bisht </div>