[M4IF Technotes] MPEG4 (and MPEG2) simultaneous audio elementary streams ...

[Rob Koenen]

> I know MPEG2/4 allow for multiple audio elementary streams in 
> the PS / 
> TS i.e. different languages.  Does MPEG2/4 allow multiple audio 
> elementary streams in differrent _formats_ i.e. one stereo, one 5.1, 
> etc.?

Don't believe this was ever answered ... the answer is yes, MPEG-4
does allow this. 
In addition, MPEG-4 allows you to send 5.1 audio and to define (and
send to the decoder) different downmixes for different listening 
conditions. Which downmix is used can then be determined at the decoder. 
This is done using AudioBiFS, which can be used to define the 'Audio
Scene'.
Maybe one of the audio experts on the list can give some more detail.
Rob
> -----Original Message-----
> From: John Michael Zorko [mailto:j.zorko   att.net] 
> Sent: Wednesday, April 09, 2024 22:23
> To: technotes   lists.m4if.org
> Subject: [M4IF Technotes] MPEG4 (and MPEG2) simultaneous 
> audio elementary streams ...
> 
> 
> 
> Hello, all ...
> 
> I know MPEG2/4 allow for multiple audio elementary streams in 
> the PS / 
> TS i.e. different languages.  Does MPEG2/4 allow multiple audio 
> elementary streams in differrent _formats_ i.e. one stereo, one 5.1, 
> etc.?
> 
> Regards,
> 
> John
> 
> Falling You - exploring the beauty of voice and sound
> New EP, "hope thrown down," available now at
> http://www.mp3.com/fallingyou
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> Technotes mailing list
> Technotes   lists.m4if.org
> http://lists.m4if.org/mailman/listinfo/technotes
>