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Topic: Use of element instance tag in AAC (Read 2503 times) previous topic - next topic

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  • pratheekp
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Use of element instance tag in AAC
Hi experts,

                In AAC while reading syntactic elements, the first 4 bits read is element_instance_tag. Actually what is its use?? Please help

Regards
Pratheek

  • benski
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  • Developer
Use of element instance tag in AAC
Reply #1
It was meant to be used as a method of simulcasting.  I'm not aware of any actual use of it (perhaps some private implementations?).

  • .alexander.
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Use of element instance tag in AAC
Reply #2
It was meant to be used as a method of simulcasting.  I'm not aware of any actual use of it (perhaps some private implementations?).


what is simulcasting? I can recall some RFC that suggests fragmentation of large AAC frames over few RTP packets using syntactic element boundaries

  • pratheekp
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Use of element instance tag in AAC
Reply #3
Is it used with multi channel AAC?? Because with stereo and mono streams, we never use this element_instance_tag after reading. For coupling we specify the element_instance_tag of target channels.. is it used for that purpose??