W3C home > Mailing lists > Public > whatwg@whatwg.org > December 2010

[whatwg] <video> resource selection algorithm and NETWORK_NO_SOURCE

From: Kevin Carle <kcarle@google.com>
Date: Thu, 9 Dec 2010 16:43:27 -0800
Message-ID: <AANLkTim3KrJSVivhxtCZthNcW4nRyaRGi6OmZNa0098w@mail.gmail.com>
On Thu, Dec 9, 2010 at 1:42 AM, Simon Pieters <simonp at opera.com> wrote:

> On Thu, 09 Dec 2010 02:58:12 +0100, Ian Hickson <ian at hixie.ch> wrote:
>
>  On Wed, 1 Sep 2010, Simon Pieters wrote:
>>
>>>
>>> I think it might be good to run the media element load algorithm when
>>> setting or changing src on <source> (that has a media element as its
>>> parent), but not type and media (what's the use case for type and
>>> media?). However it would fire an 'emptied' event for each <source> that
>>> changed, which is kind of undesirable. Maybe the media element load
>>> algorithm should only be invoked if src is set or changed on a <source>
>>> that has no previous sibling <source> elements?
>>>
>>
>> What's the use case? Just set .src before you insert the element.
>>
>
> The use case under discussion is changing to another video. So the element
> is already inserted and already has src.
>
> Something like:
>
> <video controls autoplay>
>  <source src=video1.webm type=video/webm>
>  <source src=video1.mp4 type=video/mp4>
> </video>
> <script>
> function loadVideo(src) {
>  var video = document.getElementsByTagName('video')[0];
>  sources = video.getElementsByTagName('source');
>  sources[0].src = src + '.webm';
>  sources[1].src = src + '.mp4';
> }
> </script>
> <input type="button" value="See video 1" onclick="loadVideo('video1')">
> <input type="button" value="See video 2" onclick="loadVideo('video2')">
> <input type="button" value="See video 3" onclick="loadVideo('video3')">
>
>
Is that really any better than:

function loadVideo(src) {
 var video = document.getElementsByTagName('video')[0];
 if(video.canPlayType("video/webm") != "") {
   video.src = src + '.webm';
 }
 else {
   video.src = src + '.mp4';
 }
}

-Kevin

-- 
> Simon Pieters
> Opera Software
>
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