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RE: Canvas, Audio, Video Test Submission

From: Kris Krueger <krisk@microsoft.com>
Date: Fri, 25 Jun 2010 16:12:04 +0000
To: Simon Pieters <simonp@opera.com>, Matthew Gregan <kinetik@flim.org>, "'public-html-testsuite@w3.org' (public-html-testsuite@w3.org)" <public-html-testsuite@w3.org>
Message-ID: <FA9085650D2F8B4A9D501ED9D9706E9A12567A58@TK5EX14MBXW652.wingroup.windeploy.ntdev.microsoft.com>
I understand that though the reason we didn't choose to use this was that the canPlayType call may not actually lead to media being able to be played.
For example when a UA returns probably it doesn't actually mean that the media will play.

If we want to use this then I would encourage to have this api changed to be binary (yes/no) so that a web dev can be confident that an end user will actually see media playing.

From the w3c HTML5 spec 
The canPlayType(type) method must return the empty string if type is a type that the user agent knows it cannot render; it must return "probably" if the user agent is confident that the type represents a media resource that it can render if used in with this audio or video element; and it must return "maybe" otherwise. Implementors are encouraged to return "maybe" unless the type can be confidently established as being supported or not. Generally, a user agent should never return "probably" if the type doesn't have a codecs parameter.

-----Original Message-----
From: Simon Pieters [mailto:simonp@opera.com] 
Sent: Friday, June 25, 2010 1:28 AM
To: Matthew Gregan; 'public-html-testsuite@w3.org' (public-html-testsuite@w3.org); Kris Krueger
Subject: Re: Canvas, Audio, Video Test Submission

On Fri, 25 Jun 2010 03:27:50 +0200, Kris Krueger <krisk@microsoft.com>

> Thanks for the feedback - what is the UA string for the nightly FF build?
> In theory we could change the tests so the FF Nightly build gets an 
> appropriate video format.

You're missing the point. Remove the browser sniffing altogether and replace it with:

if (document.createElement('video').canPlayType('video/ogg;
codecs="theora, vorbis"'))
   extension = '.ogv';

> -----Original Message-----
> From: Matthew Gregan [mailto:kinetik@flim.org]
> Sent: Thursday, June 24, 2010 5:37 PM
> To: Kris Krueger
> Subject: Re: Canvas, Audio, Video Test Submission
> Hi Kris,
> Thanks for the tests.  I've run through all of the video tests with a 
> nightly Firefox build and made sure we had bugs filed for any that 
> failed.
> One problem I ran into with the video tests is that they use user 
> agent sniffing to determine the video format to use for the tests.  
> This means that regular Firefox nightly builds fail most of the tests 
> as it deliberately uses a non-Firefox user agent to catch problems like this.
> I think the best way to solve this problem would be to modify the 
> tests to use canPlayType to determine an appropriate video format to 
> use for the user agent under test.
> Thanks,
> -mjg

Simon Pieters
Opera Software

Received on Friday, 25 June 2010 16:12:41 UTC

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