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scope of media stream recording and capture specification(s)

From: Glenn Adams <glenn@skynav.com>
Date: Wed, 6 Feb 2013 09:48:44 -0700
Message-ID: <CACQ=j+cpUsefBFP8N6GzH+8QzJu4n3_Xm3Er5dBdU8_1YD7Ccw@mail.gmail.com>
To: public-media-capture@w3.org
Cc: W3C Web and TV <public-web-and-tv@w3.org>
As presently specified, the MediaStream Recording specification [1] is
characterized as a generic recording API without limitation of scope.
However, the abstract states:


This document defines a recording API for use with MediaStreams as defined
> in Media Capture and Streams [GETUSERMEDIA<http://www.w3.org/TR/2013/WD-mediastream-recording-20130205/#bib-GETUSERMEDIA>
> ].



In contrast, the reference [GETUSERMEDIA] refers to [2], which states in
its introduction:

> Access to multimedia streams (video, audio, or both) from local devices
> (video cameras, microphones, Web cams) can have a number of uses, such as
> real-time communication, recording, and surveillance.
>


> This document defines the APIs used to get access to local devices that
> can generate multimedia stream data. This document also defines the stream
> API by which JavaScript is able to manipulate the stream data or otherwise
> process it.



In this latter case, the scope is limited to "local devices" such as
cameras, phones, etc. In addition, the MediaStream Recording specification
[1] defines interface members such as: image{Height,Width}, onphoto,
takePhoto, which are clearly oriented to specific kinds of local devices.

As such, I would like to see the title and description of MediaStream
Recording [1] changed to reflect its application to local devices. For
example,

   - change title to "MediaStream Recording of Local Input Devices"
   - change short name from mediastream-recording to
   mediastream-local-device-recording
   - change abstract and introduction to make clear this scope is limited
   to local devices

Similar changes are suggested for the title and short name of Media Capture
and Streams to make it clear to readers that other uses are not in scope,
such as capture and recording of non-local media stream.

As an alternative, the scope of these two specifications could be
explicitly widened to include capture and recording of non-local media
streams, in which case, the work would need to be coordinated with the Web
& TV IG's Recording and Downloading Media Task Force [3].

Regards,
Glenn

[1] http://www.w3.org/TR/2013/WD-mediastream-recording-20130205/
[2] http://www.w3.org/TR/2012/WD-mediacapture-streams-20120628/
[3] http://www.w3.org/2011/webtv/wiki/Download
Received on Wednesday, 6 February 2013 16:49:33 UTC

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