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Re: [whatwg] <video> feedback

From: Mark Callow <callow.mark@artspark.co.jp>
Date: Thu, 20 Dec 2012 17:27:38 +0900
Message-ID: <50D2CBFA.9050704@artspark.co.jp>
To: Ian Hickson <ian@hixie.ch>
Cc: whatwg@whatwg.org, Jer Noble <jer.noble@apple.com>
On 2012/12/18 9:01, Ian Hickson wrote:
> On Tue, 2 Oct 2012, Jer Noble wrote:
>> The nature of floating point math makes precise frame navigation 
>> difficult, if not impossible.  Rob's test is especially hairy, given 
>> that each frame has a timing bound of [startTime, endTime), and his test 
>> attempts to navigate directly to the startTime of a given frame, a value 
>> which gives approximately zero room for error.
>>
>> ...
> That makes sense.
>
> Should we add a preciseSeek() method with two arguments that does a seek 
> using the given rational time?
>

I draw your attention to "Don't Store that in a float
<http://randomascii.wordpress.com/2012/02/13/dont-store-that-in-a-float/>"
and its suggestion to use a double starting at 2^32 to avoid the issue
around precision changing with magnitude as the time increases.

Regards

    -Mark

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Received on Thursday, 20 December 2012 08:29:00 UTC

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