situations where we have small snippets of audio that are synchronized to particular times in the video (as shown below) are not considered here.Content in alternate audio/video tracks that goes beyond the duration of the main resource will be chopped off and never play back. we assume that the alternate audio/video tracks are provided as a single file with approximately the same duration as the main resource and that synchronisation between them implies synchronizing their starting points and playback speed.This restricts authoring, but if somebody wants to do replacement, they can always define alternative audio and video elements and activate them through JavaScript. we assume tracks are created in such a fashion that the can add to each other, not replace each other.
Multiple html5 audio players on same page how to#
there is no new markup needed for in-band, just a JavaScript API and notes on how to render.Other use cases should not get dedicated markup and can be satisfied through special JavaScript or server software. we want to support the most important and most scalable use case natively and encourage that as the main means to author content, namely by providing a main resource and additional tracks to complete that presentation.we don't want to screw with the source selection algorithm which is already complicated enough as is.
we want to be able to control the relative volume of a additional audio track and the positioning of video tracks as picture-in-picture or side-by-side viewports. we want to achieve a consistent API between in-band and external audio/video tracks. We need to define a JavaScript API that lets us control the display/playback of individual video/audio tracks both out of in-band multitrack media resources and out of constructed multitrack resources from multiple external files. We need a means to provide multitrack media resources to the Web page where the multiple tracks come in multiple resources.Ģ. We need a means to make use of such multitrack media content in HTML5.ġ. You can check out for an example of audio descriptions in Flash that we want to replicate in HTML5. Currently there is no means in HTML5 to use such multitrack media resources. Sometimes such tracks are an inherent part of the main media resource, in other instances they are separate by synchronised resources. In particular we often have sign language tracks, audio description tracks, dubbed audio tracks, but also alternate viewing angles and similar additional or alternative tracks to the main a/v tracks. 1.10 (10) HTML Accessibility Task Force proposal - "The San Diego Thought Experiment"Īudio and video often have more than one audio and one video track. 1.9 (9) Audio Track Selection for Media Element / In-band only. 1.7 (7) Overload to link a/v element from other place on page. 1.6 (6) Synchronize separate media elements through attributes. 
1.1 (1) No markup in HTML - leave to a manifest file.
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