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-04.txt
Pages : 23
Date : 2011-05-12
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 and/or profiles
employed by the media formats contained within. 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. 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-04.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-04.txt
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