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Extending createObjectUrl to MediaStream?

From: Dominique Hazael-Massieux <dom@w3.org>
Date: Wed, 28 Aug 2013 17:48:15 +0200
Message-ID: <1377704895.4130.299.camel@cumulustier>
To: public-webapps@w3.org
Cc: public-media-capture@w3.org
Hi WebApps WG,

The Media Capture Task Force (responsible for specs that deal with
MediaStream objects [1]) has been considering whether one should be able
to assign a MediaStream to <video> and <audio> elements via an URL
obtained via createObjectURL or not, and is seeking feedback on the

More precisely:
A. we define a new srcObject attribute on HTMLMediaElement objects that
can take directly a MediaStream object and make it playable
  video.srcObject = mediastream;
B. the spec also supports assigning a MediaStream via the src attribute,
via an URL obtained through createObjectURL:
 video.src = URL.createObjectURL(mediastream);

While there are ongoing discussions on how to spec B properly [2] (which
will require coordination with the WebApps Working Group), we are first
and foremost wondering if that option is needed at all.

We are thus looking for input on the use cases for createObjectURL as
used for the File API, and whether these use cases would also apply to
our MediaStream case. In general, is there a need for any object
readable by media elements to support an URL-based approach for
consistency with the rest of the platform?


Dom for capture-ACTION-23

1. http://dev.w3.org/2011/webrtc/editor/getusermedia.html
2. https://www.w3.org/Bugs/Public/show_bug.cgi?id=19594
Received on Wednesday, 28 August 2013 15:48:29 UTC

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