MPEG asks for MIME review for the MPEG21 file format

[Dave Singer]

At 14:27  +0200 24/05/07, Christian Timmerer (ITEC) wrote:
>Dear Graham,
>
>>  Is there any chance that the standardization committee might be
>>  persuaded to
>>  make public release of part 9, describing this file format, in addition
>>  to parts
>>  1, 2 and the schema already made public?  I think that doing so would
>>  make the
>>  MPEG21 vision accessible to a wider base of developers.
>[Christian Timmerer (ITEC)] Yes there is a 
>chance but it might be difficult since ISO is 
>usually doing this only for technical reports, 
>reference software, and in some exceptional 
>cases for so-called "baseline" standards, i.e., 
>those that are most relevant for a particular 
>standard in order to become adopted by others 
>(e.g., Part 2 of MPEG-21).
>
>Furthermore, MPEG-21 Part 9 is based on the ISO 
>base media file format which is a joint standard 
>between MPEG and JPEG. The ISO base media file 
>format is indeed publicly available [1-4]. 
>However, we might get into troubles why we're 
>asking ISO to make MPEG-21 Part 9 publicly 
>available but not other MPEG file formats, etc. 
>Dave might correct me if I say something wrong 
>here.
>
>I think the best and easiest way how to proceed 
>is to provide you (=IETF) the relevant 
>(=MPEG-21) file format standard(s) through 
>liaison at the next meeting which is at the 
>beginning of July in Lausanne. Anyway, I'll also 
>ask whether it is feasible to make Part 9 of 
>MPEG-21 publicly available.
>
>Thanks.
>Best regards,
>  -Christian

We can probably sum up what part 9 says well 
enough for you.  It's short enough!

An MPEG-21 file has the following boxes from the public part 12 spec.:

ftyp
meta, whose primary item is an MPEG-21 DIDL
   handler, saying it's mpeg-21
   item location
   item information
and probably an mdat


>
>[1] 
>http://standards.iso.org/ittf/PubliclyAvailableStandards/c041828_ISO_IEC_14496-12_2005(E).zip
>[2] 
>http://standards.iso.org/ittf/PubliclyAvailableStandards/c042292_ISO_IEC_14496-12_2005_Cor_1_2005(E).zip
>[3] 
>http://standards.iso.org/ittf/PubliclyAvailableStandards/c043226_ISO_IEC_14496-12_2005_Cor_2_2006(E).zip
>[4] 
>http://standards.iso.org/ittf/PubliclyAvailableStandards/c043689_ISO_IEC_14496-12_2005_Amd_1_2007(E).zip
>
>
>
>>
>>  #g
>>  --
>>
>>
>>  Christian Timmerer (ITEC) wrote:
>>  >
>>  >
>>  > Dear all,
>>  >
>>  >   as the "source" of this MIME type please apologize my late reply
>>  > because I was one week w/o email access. It took some time to catch
>>  up.
>>  > Regarding the "+xml" suffix I agree that it is inappropriate since an
>>  > MPEG-21 file is not purely XML (see below for further details).
>>  >
>>  >
>>  >
>>  > MPEG-21 Part 1 (Technical Report) is publicly available [1].
>>  >
>>  >
>>  >
>>  > Concerning Digital Items, Digital Item Declaration, and MPEG-21 File
>>  > Format, let me try to clarify something because I think there's a
>>  > misunderstanding:
>>  >
>>  > ·         A Digital Item can be seen as a digital container format
>>  that
>>  > puts (media) resources (e.g., audio, video, image, text (PDF), etc.)
>>  and
>>  > metadata (e.g., data describing the resources, licenses, identifiers,
>>  > etc.) within a standardized structure.
>>  >
>>  > ·         A Digital Item is declared by an Digital Item Declaration
>>  > (DID) which is based on the Digital Item Declaration Language (DIDL)
>>  > that is a representation of the Digital Item Declaration Model. The
>>  > model and DIDL are specified in MPEG-21 Part 2 which is publicly
>>  > available [2]. The model is an abstract model defined using EBNF
>>  whereas
>>  > DIDL - the representation of the model - is defined using XML Schema,
>>  > thus, DID is XML-based. That is, it is possible that other,
>>  > non-XML-based representation may be derived from the model (However,
>>  > this should not be the discussion point)
>>  >
>>  > ·         A Digital Item may be distributed which means that its
>>  > declaration (i.e., DID) may be at one location whereas its (media)
>  > > resources and metadata may be located elsewhere on various locations.
>>  >
>>  > ·         The MPEG-21 file puts everything, i.e., (media) resources,
>>  > metadata, and structure (i.e., declaration), into one file, the MPEG-
>>  21
>>  > file which is binary and contains the DID and (maybe) also the
>>  > referenced/included (media) resources.
>>  >
>>  >
>>  >
>>  > Hope this information is helpful for you.
>>  >
>>  >
>>  >
>>  > Thank you.
>>  >
>>  > Best regards,
>>  >
>>  >  -Christian
>>  >
>>  >
>>  >
>>  > [1]
>>  >
>>  http://standards.iso.org/ittf/PubliclyAvailableStandards/c040611_ISO_IE
>>  C_TR_21000-1_2004(E).zip
>>  >
>>  > [2]
>>  >
>>  http://standards.iso.org/ittf/PubliclyAvailableStandards/c041112_ISO_IE
>>  C_21000-2_2005(E).zip
>>
>>
>>  --
>>  Graham Klyne
>>  For email:
>>  http://www.ninebynine.org/#Contact


-- 
David Singer
Apple Computer/QuickTime