RFC 3803 (rfc3803) - Page 1 of 5

Content Duration MIME Header Definition

Alternative Format: Original Text Document
Next >
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
Next >