[whatwg] Synchronized play/seek of multiple <audio> elements?
chaals at opera.com
Thu Feb 26 07:24:04 PST 2009
On Thu, 19 Feb 2009 01:43:22 -0000, David Singer <singer at apple.com> wrote:
> At 10:20 +0000 18/02/09, Ian Hickson wrote:
>> On Wed, 18 Feb 2009, Emil Tin wrote:
>>> However, I've been unable to find any information on how to trigger
>>> several audio files in a synchronized manner.
>>> Does the html 5 specification provide any way to to this?
>> Not currently.
> Yes. We felt it would be a major complication to the spec., and wanted
> to keep things simple for the first iteration.
A problem arises for accessibility, when you extend this to video and need
to synchronise captions / subtitles / audio descriptions, if they are not
included in the original resource.
There are various use cases for having the resource be stand-alone, and
also for compound resources that HTML5 can pull together. At the FOMS
discussion of accessibility, I believe the end result was an understanding
(no formal resolution) that both approaches needed to be supported.
This could be done in HTML5 by recommending something like a SMIL resource
to deal with the second use case, shifting the implementation requirement
to support (at least some of) SMIL for playing video. Or by adding some
simple timing stuff to HTML itself, although that makes for backwards
incompatibility even with current browsers having native video support. Or
using SVG and pegging its timeline to the enclosing video, or ...
These are not ready-made solutions, they are thoughts about possible
Charles McCathieNevile Opera Software, Standards Group
je parle français -- hablo español -- jeg lærer norsk
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