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Content Duration MIME Header Definition (RFC3803)

IP.com Disclosure Number: IPCOM000029311D
Original Publication Date: 2004-Jun-01
Included in the Prior Art Database: 2004-Jun-23
Document File: 6 page(s) / 8K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Vaudreuil: AUTHOR [+2]

Abstract

This document describes the MIME header Content-Duration that is intended for use with any time varying media content (typically audio/* or video/*).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 33% of the total text.

Network Working Group                                       G. Vaudreuil

Request for Comments: 3803                           Lucent Technologies

Obsoletes: 2424                                               G. Parsons

Category: Standards Track                                Nortel Networks

                                                               June 2004

                Content Duration MIME Header Definition

Status of this Memo

   This document specifies an Internet standards track protocol for the

   Internet community, and requests discussion and suggestions for

   improvements.  Please refer to the current edition of the "Internet

   Official Protocol Standards" (STD 1) for the standardization state

   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   This document describes the MIME header Content-Duration that is

   intended for use with any time varying media content (typically

   audio/* or video/*).

1.  Introduction

   This document describes the MIME header Content-Duration that is

   intended for use with any time varying media content (typically

   audio/* or video/*).  The length of time is represented in seconds

   without any units indication.  This document obsoletes RFC 2424.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

   document are to be interpreted as described in RFC 2119 [REQ].

2.  Content-Duration Header Field

   Time varying media contents, for example, a spoken voice message or a

   video clip, have an inherent time duration.  Many audio and video

   encodings may include their duration as header information or may

   allow accurate calculation based on the byte length of the data.

   However, it may be useful to present the time duration of the content

   in a MIME header to allow its simple determination without dealing

   with the actual content.

Vaudreuil, et al.           Standards Track                     [Page 1]

RFC 3803        Content Duration MIME Header Definition        June 2004

2.1.  Syntax

   The Content-Duration field's value is a single number specifying the

   time duration in seconds of the content.  Formally:

   duration := "Content-Duration" ":" 1*10DIGIT

   Note that practically (though highly unlikely in MIME media), the

   upper bound on the numerical value of the time duration is (2^^31 -1)

   or 2147483647.

2.2.  Semantics

   This field represents the time duration of the associated time

   varying media content.  The time duration is noted in seconds with no

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