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[Bug 7428] Safari 4 preloads media and FF 3.5 doesn't in <audio> tag; perhaps HTML5 sections 4.8.10.5 4.8.10.8 are unclear or need a 'preloading' attribute added.

From: <bugzilla@wiggum.w3.org>
Date: Thu, 27 Aug 2009 02:00:11 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1MgUHb-0007ex-MS@wiggum.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=7428





--- Comment #5 from Robert O'Callahan (Mozilla) <roc@ocallahan.org>  2009-08-27 02:00:11 ---
> Until then at least, the author is in the best position to know
> whether or not preloading of LARGE NUMBERS of media files should even be
> attempted. 

I agree, that's why we have autobuffer and why Firefox behaves as it does.

> Are there situations where Firefox slows or stops preloading of media when
> there is danger of the page user losing the ability to interact because of lack
> of bandwidth/cpu?

Yes. We have a limit on the size of data we preload, in a typical configuration
it's 50MB. So if you have some large media files that have 'autobuffer', we
will download them until their combined size reaches about 50MB, and then we'll
pause the downloads until some of the data has been played or some of the
elements are destroyed.

Downloads generally shouldn't stress the CPU. We should probably throttle
bandwidth used by autobuffering, but we haven't gotten around to that yet.


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Received on Thursday, 27 August 2009 02:03:18 GMT

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