At 12:01 +1200 19/06/09, Robert O'Callahan wrote: >On Fri, Jun 19, 2009 at 7:05 AM, David Singer ><<mailto:singer@apple.com>singer@apple.com> wrote: > >At 16:32 +1200 18/06/09, Robert O'Callahan wrote: > >>On Wed, Jun 17, 2009 at 7:15 PM, Maciej Stachowiak >><<mailto:mjs@apple.com>mjs@apple.com> wrote: >> >>On Jun 16, 2009, at 11:12 PM, Adam Barth wrote: >> >>I think roc was specifically referring to content for the <video> tag. >>Because no such content currently exists, the legacy compatibility >>requirements are much less onerous than, say, for HTML. >> >> >>I think Dave's point was that if you support codecs and containers >>in <video> that are currently supported by widely used plugins, >>then you are more likely to face these legacy issues with broken >>MIME types when deploying <video>. Content authors might well >>expect that already published MP4 files which work in the QuickTime >>plugin or a Flash-based player, should continue to work if embedded >>via <video>. >> > > >They may expect that, but breaking that expectation is less of a >problem than breaking actual existing content. > > >sorry, you've lost me. breaking that expectation does break >existing content; and I can't see how doing content sniffing breaks >more content than not. can you explain? > > >Currently there is almost no existing content that uses the <video> >element to play media files that are being served with incorrect >Content-Types. (Please correct me if I'm wrong about this.) >Therefore, not sniffing for <video> should break almost no existing >content. > >Maciej suggests there is a significant amount of content using >plugins (Flash or Quicktime, I suppose) to play media files served >with incorrect Content-Types, and therefore authors will be >surprised if they attempt to use <video> to play those files and >they don't work. > >I say that "author surprise" is much less of a problem than >"existing Web pages stop working". But I may well be able to re-author my HTML but completely unable to influence my hosting provider to provide the correct MIME types. I don't want users trapped into using the old because we've made the new inaccessible to them. -- David Singer Multimedia Standards, Apple Inc.
Received on Friday, 19 June 2009 00:11:32 UTC