[Mp4-tech] RE: how to decode audioMuxElements

[Bernhard Grill]

Wenjun Zheng wrote:
> Hi,
> 
> We stream MPEG4 movies from an ISMA server, the audio is AAC or MP3.  We are
> developing our own client.  In the audio RTP packets, we saw some extra
> bytes were added in front of the AAC/MP3 packet(s).  I guess they are the
> audioMuxElements refered in "RFC 3016:  RTP Payload Format for MPEG-4
> Audio/Visual". 

No. For ISMA you don't need to implement RFC 3016 but ISMA 1.0 / RFC 3640.
 Can someone point to me where I can find the details about
> the terms such as audioMuxElement, muxConfigPresent, StreamMuxConfig, and so
> on?

Look for LATM in ISO IS 14496-3 (MPEG-4 Audio). You'll find it in subpart 1 of
MPEG-4 Audio.
Best regards,
Bernhard Grill
> 
> Thank you in advance for your help.
> 
> Best,
> 
> -Wenjun
> 
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-- 
Dr. Bernhard Grill                                  email: grl iis.fhg.de
Head of Audio Department, FhG-IIS A                 phone: +49 9131 776-351
Am Wolfsmantel 33, D-91058 Erlangen, Germany        FAX:   +49 9131 776-398