[whatwg] Proposal: Media element - add attributes for discovery of playback rate support

Ian Hickson ian at hixie.ch
Tue Jul 16 16:45:16 PDT 2013

On Wed, 30 Jan 2013, Peter Carlson (carlsop) wrote:
> Problem: The problem is that the supported playback speeds of a media 
> element may vary per media item (e.g., an on-demand movie) and as 
> supported by the underlying platform. Currently the application has to 
> discover the supported speeds by trial and error or by an alternative 
> non-HTML5 method that links to the media element.
> Recommendation: We suggest that the application should be able to 
> discover the available speeds at which it can play the media element. 
> These speeds provide the allowed playbackRate values. These speeds are 
> provided as attributes of the media element.

This seems less good than just having the browsers support all playback 
speeds, e.g. by decoding into a local buffer. Why would we prefer to 
expose the media's limitations rather than removing them?

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'

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