[whatwg] media element playback rates

Kevin Calhoun kcalhoun at apple.com
Mon Nov 5 07:44:54 PST 2007

On Nov 2, 2007, at 11:47 PM, Ian Hickson wrote:

> On Fri, 2 Nov 2007, Kevin Calhoun wrote:
>> A consideration in raising this issue now is that in our  
>> prototyping we
>> rediscovered the need for the media engine to be informed in advance,
>> whenever possible, of the rate at which it will be required to  
>> play, in
>> order to prepare itself appropriately.
> How far in advance? Would passing an argument to play() satisfy this?
> (i.e. can it be immediately before playback begins, or does it have  
> to be
> measurably earlier?)

Indefinitely earlier -- allowing the media to pass through arbitrary  
states as needed before playback at the requested rate is ready.

>> In the alternative model Dave described, the same operations you  
>> enumerated
>> are also readily performed as below [...]
> With the proposal, I don't see how you can set the speed in one  
> controller
> and then have another controller do fast-forward and then have the  
> first
> controller resume play again, which is a design requirement for this  
> API.

Multiple controllers of the same media, hmmm. Can you say more about  
these requirements?

- Kevin Calhoun
   Apple Inc./QuickTime

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