[Mp4-tech] automatic tagging and gapless playback for MP4 files

[AVARO Olivier FTRD/DIH/REN]

Small addition : the MPEG document mentionned are currently available only to MPEG membership, so as Rob mentioned to me, this could be a bit frustrating for non-MPEG members interested in the topic. Since I think those docs are very timely and valuable, I'll investigate if MPEG can publish them on the MPEG Web site at its next meeting in October.
Kind regards,
Olivier  
> -----Message d'origine-----
> De : AVARO Olivier FTRD/DIH/REN 
> Envoyé : jeudi 28 août 2003 09:33
> À : Hans-Juergen Bardenhagen; mp4-tech lists.mpegif.org
> Objet : RE: [Mp4-tech] automatic tagging and gapless playback for MP4
> files
> 
> 
> Dear all,
> 
> There are a couple a ways to have metadata associated to 
> MPEG-4 content.
> 
> On the  way to express metadata MPEG defines:
> - OCI (Object Content Information) : simple and 
> straightforward. Defined in 14496-1 before MPEG-7 standard 
> was here. The main content descriptors are: content 
> classification descriptors, keyword descriptors, rating 
> descriptors, language descriptors, textual descriptors, and 
> descriptors about the creation of the content. OCI 
> association is fully defined in 14496-1. 
> - MPEG-7 : Much more powerfull expression of description (see 
> MPEG-7 description on the MPEG Web page for more info. or the 
> MPEG-7 standard ISO/IEC 15938). 
> - MPEG-21 also could be seen for some part as metadata but 
> this goes beyond the scope of the thread.
> 
> On the way to associated metadata to content:
> - OCI or MPEG-7 descriptors can be included directly in the 
> related object descriptor or elementary stream descriptor or, 
> if it is time variant, it may be carried in an elementary 
> stream by itself. MPEG-7 association through object 
> descriptor is not yet fully defined though.
> - Extensions of the MP4 file format structure under 
> investigation in MPEG allows association of static metadata 
> to content. Use of MPEG-7 (and support of other type of 
> metadata) will be there fully supported. This is documented 
> in N5789 from MPEG meeting in Trondheim (July 2003).
> 
> A complete and simple example to use all this is provided in 
> MPEG doc. N5723 from Trondheim (Importing MP3 into an MPEG-4 
> World). It provides a mapping from ID3V1.1 Tags to MPEG-7 and 
> its packing in MP4.
> 
> Kind regards,
> 
> Olivier
> 
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