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Use of element instance tag in AAC
pratheekp
post Jun 29 2012, 16:26
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Hi experts,

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

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Pratheek
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benski
post Jun 29 2012, 16:49
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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?).
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.alexander.
post Jun 29 2012, 17:18
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QUOTE (benski @ Jun 29 2012, 19:49) *
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
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pratheekp
post Jun 30 2012, 12:59
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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??
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