[Mp4-tech] multiplexing 2 audio file + video file

[Michelle Y Kim]

Sabriana, 
 Perhaps you haven't seen the answer to this question posted on the IBM 
alphaWorks forum. You can use the XmtBatch tool which is part of the IBM 
Toolkit for MPEG-4 to  multiplex multiple audios and videos in a single 
.mp4 file.  It uses the SMIL-like XMT syntax  which can then be compiled 
to  produce an mp4 format. A simple example  given by you can be 
represented as: 
<par>
<audio begin="0s" dur="10s" src="audio1.aac"/>
<audio begin="5s" dur="5s" src="audio2.aac"/>
<video begin="0s" dur="10s" src="video1.cmp"/>
</par>
in this example,  audio1 starts at time "0s" along with  video1, and at 
time "5s", audio2 starts. At time "10s" both audios  and the video will 
stop.    You can use "begin" and  "dur" attributes to indicate the  offset 
of the start time and duration for each element.  The three elements in 
this example are enclosed in a <par>  ("par" for parallel) container, and 
the begin time is relative to the begin time of the "par" container. BTW, 
the XMT also supports the <seq> (for sequential) container, whose 
semantics you can easily infer.  A very short example would be:
<seq>
<video dur="10s" src="video1.cmp"/>
<video dur="10s" src="video2.cmp"/>
</seq>
As you might have guessed, in this example video1 starts when the seq 
container starts, plays for 10s,  after which  video2 starts, etc.
  Regards,
  Michelle
  Dr. Michelle Y. Kim, IBM T. J. Watson Research Center
  Manager, Composite Media Technologies Group
  mykim us.ibm.com (e-mail)
  (914) 784-7709 (voice)
  (914) 784-7455 (fax)
sabrina <pina_sabrina yahoo.fr>
Sent by: mp4-tech-bounces lists.mpegif.org
09/29/2003 04:51 AM
        To:     Technotes lists.m4if.org
        cc: 
        Subject:        [Mp4-tech] multiplexing   2 audio file  +  video 
file
thinks for yours response 
I created an .mp4 file by multiplexing the .cmp and .aac file 
for this i used the ibm tools, it is simple and it work correctly 
the only problem is that i can 't multiplex 2 audio file with an video 
file 
i would to know  what tools i can use to do this multiplex ?
@ +
sabrina 
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