[Mp4-tech] SYSTEMS

[Mohit Agarwal]

Hi,
Subclause 2.6 of H.222.0 mentions the following Descriptors.
1)Target Background grid Descriptor
2)Video window descriptor
3)System Clock Descriptor
Can anybody tell me where are descriptors placed whether in PMT,PES or
somewhere else??
Which of these Descriptors are Mandatory??
Thanks
Mohit
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