Hi I am having some difficulty decoding audio from an IP camera, the RTSP negotiation for audio is such: v=0 o=- 1266870982069588 1266870982069588 IN IP4 10.11.11.189 s=Media Presentation e=NONE c=IN IP4 0.0.0.0 b=AS:50016 t=0 0 a=control:* a=range:npt=0.000000- m=video 0 RTP/AVP 96 b=AS:50000 a=framerate:10.0 a=control:trackID=1 a=rtpmap:96 H264/90000 a=fmtp:96 packetization-mode=1; profile-level-id=420029; sprop-parameter-sets=Z0IAKeKQFAe2AtwEBAaQeJEV,aM48gA== m=audio 0 RTP/AVP 97 b=AS:16 a=control:trackID=2 a=rtpmap:97 mpeg4-generic/16000/1 a=fmtp:97 profile-level-id=15; mode=AAC-hbr;config=1408; SizeLength=13; IndexLength=3;IndexDeltaLength=3; Profile=1; bitrate=16000; in a previous discussion, it has been pointed out that config=1408 corresponds to Low Complexity Sampling Frequency, 16000 Hz, 1 channel So this should be supported by the native aac decoder. I also was unable to transcode the following aac file to vorbis ogg http://www.nch.com.au/acm/sample.aac I am using SVN-r19905