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HydrogenAudio

Lossy Audio Compression => AAC => AAC - Tech => Topic started by: pratheekp on 2012-06-29 16:26:40

Title: Use of element instance tag in AAC
Post by: pratheekp on 2012-06-29 16:26:40
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
Title: Use of element instance tag in AAC
Post by: benski on 2012-06-29 16:49:15
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?).
Title: Use of element instance tag in AAC
Post by: .alexander. on 2012-06-29 17:18:08
Quote from: benski on
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
Title: Use of element instance tag in AAC
Post by: pratheekp on 2012-06-30 12:59:40
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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