A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : The Codecs and Profiles Parameters for "Bucket" Media Types
Author(s) : Randall Gellens
David Singer
Per Frojdh
Filename : draft-gellens-mime-bucket-bis-09.txt
Pages : 25
Date : 2011-08-03
Several MIME type/subtype combinations exist that can contain
different media formats. A receiving agent thus needs to examine the
details of such media content to determine if the specific elements
can be rendered given an available set of codecs. Especially when
the end system has limited resources, or the connection to the end
system has limited bandwidth, it is helpful to know from the Content-
Type alone if the content can be rendered.
This document specifies two parameters, "codecs" and "profiles",
which are used with various MIME types or type/subtype combinations
to allow for unambiguous specification of the codecs employed by the
media formats contained within, or the profile(s) of the overall
container format. This document obsoletes RFC 4281; RFC 4281 defines
the "codecs" parameter, which this document retains in a backwards
compatible manner with minor clarifications; the "profiles" parameter
is added by this document.
By labeling content with the specific codecs indicated to render the
contained media, receiving systems can determine if the codecs are
supported by the end system, and if not, can take appropriate action
(such as rejecting the content, sending notification of the
situation, transcoding the content to a supported type, fetching and
installing the required codecs, further inspection to determine if it
will be sufficient to support a subset of the indicated codecs, etc.)
Similarly, the profiles can provide an overall indication, to the
receiver, of the specifications with which the content complies.
This is an indication of the compatibility of the container format
and its contents to some specification. The receiver may be able to
work out the extent to which it can handle and render the content by
examining to see which of the declared profiles it supports, and what
they mean.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-gellens-mime-bucket-bis-09.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-gellens-mime-bucket-bis-09.txt
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