[whatwg] <video> resource selection algorithm and NETWORK_NO_SOURCE

[Simon Pieters]

On Fri, 10 Dec 2010 01:43:27 +0100, Kevin Carle <kcarle at google.com> wrote:

>> 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

You'd need to remove the <source> elements to keep the document valid.

The author might want to have more than two <source>s, maybe with  
media="", onerror="" etc. Then it becomes simpler to rely on the resource  
selection algorithm.

-- 
Simon Pieters
Opera Software