25574 2014-05-06 09:13:47 +0000 Queue a (micro)task to change enabled audio tracks 2014-06-12 08:37:15 +0000 1 1 1 Unclassified WHATWG HTML unspecified Other other RESOLVED FIXED http://www.whatwg.org/specs/web-apps/current-work/#dom-TrackList-getKind-categories P3 normal Unsorted 1 contributor ian acolwell ian mike philipj contributor oldest_to_newest 105166 0 contributor 2014-05-06 09:13:47 +0000 Specification: http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html Multipage: http://www.whatwg.org/C#dom-TrackList-getKind-categories Complete: http://www.whatwg.org/c#dom-TrackList-getKind-categories Referrer: http://www.whatwg.org/specs/web-apps/current-work/multipage/ Comment: Queue a (micro)task to change enabled audio tracks Posted from: 83.218.67.123 User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.116 Safari/537.36 OPR/21.0.1432.48 (Edition Next) 105167 1 philipj 2014-05-06 09:21:30 +0000 If a script is to switch audio tracks, it needs to disable one and enable another. In order to make the switch gapless, it's necessary to wait until the script has finished before informing the media engine about the change. It would be nice if the spec pointed this out, so that all implementations do the same thing. The difference is possibly detectable when using the Web Audio API and certainly audible. Only one video track can be selected at a time, but maybe it would be a good idea to throw that into the same logic in case an audio track and video track are switched at the same time and somehow go together. 107686 2 ian 2014-06-11 22:24:43 +0000 I don't really see why it would have to be a microtask. I just synchronised it with reaching the event loop's step 1. (Note that this has implications with respect to alert() and company that you might want to explicitly test...) 107687 3 contributor 2014-06-11 22:25:42 +0000 Checked in as WHATWG revision r8673. Check-in comment: Make sure that we say that enabling audio tracks and selecting video tracks is all synchronised with the event loop http://html5.org/tools/web-apps-tracker?from=8672&to=8673 107702 4 philipj 2014-06-12 08:37:15 +0000 I meant a task or a microtask, either would do I think. There's now a lot of "the last time the event loop reached step 1" around media elements, which may or may not map to something sane in an implementation. Is there any particular reason you have that concept in addition to tasks and microtasks?