On Monday, Aug 11, 2003, at 09:15 Europe/London, Jose Rey wrote:
I believe SMPTE may also have timed text work in their Digital Cinema group?Colin Perkins wrote:at the moment there are at least two more standardisation bodiesA specific payload format for 3GPP timed text might be appropriate, but I would like to understand the options and alternatives before we make that choice. Is 3GPP the only body doing timed and/or decorated text? If not, what are the alternatives, and how do they relate? --
interested in timed text: MPEG and W3C.
- MPEG is currently defining their own TT format based on 3GPP TT (see
Committee Draft of ISO/IEC 14496-17 from July'03 Meeting in Trondheim)
by defining the access unit structure, the stream type, the object type
indication and decoder specific info of the timed text samples. The
definition of these items enables the transport over RTP using the
mpeg4simple draft. The work in MPEG is assumed to be finalised around
July 2004.
- W3C is at a very early stage in defining a timed text authoring
format. It has recently (May'03) published a draft for use cases and requirements of a timed text authoring format:
http://www.w3.org/TR/2003/WD-tt-af-1-0-req-20030515/. This draft has a
rather long list of requirements and lists many functionalities. In my
understanding W3C targets to a generic format with rich functionality. I
don't know how quick it may develop (anyone?).
None of these above is an option for us, because 1) the only timed textI agree that using the MPEG4-simple format doesn't make sense, and that the W3C schedule looks to be too long for 3GPP requirements.
format in 3GPP is 3GPP timed text 2) 3GPP has not adopted the mpeg4simple for
transport and 3) for this 3GPP timed text format we need an RTP payload
format within the current 3GPP Release 6 schedule (i.e. March'04).