[Mp4-tech] Mp4 File Format

[Dave Singer]

At 7:32 AM +0100 10/20/04, ghvf jyg wrote:
>Dear Experts,
>
>I am working on Mp4 File Format, with Reference to ISO standard 
>(MPEG-4 3rd Edition).Could you please clear my following doubts 
>related to it. 
>
>1)        In OD descriptors we have Es, Oci and Ipmp decriptors. Do 
>these come in order or they can be present randomly. i.e is it 
>necessary that we will have Oci Descriptor after Es Descr and Ipmp 
>Descr after Oci Descr.
>
>2)         Where is ES_Id_Ref descriptor (tag = (0x0F)) present? 
>i.e. what is its parent Descriptor ?

This is used in the file format in OD streams where an ESDescriptor 
would normally be.  It contains a track reference index, and the 
actual descriptor is in the sampleentry of the referenced track.
>
>3)        Profile Level Indication Index Descriptor (tag = 0x14) is 
>present in DecoderConfig Descriptor, but where is Extended Profile 
>Level Descriptor (Tag = 0x13) present?
>
>Thanks and Regards
>
>Rahul
>
>
>
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-- 
David Singer
Apple Computer/QuickTime
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