[Bug 23113] Deal with mode for TextTrackCues that are not VTTCues

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23113

--- Comment #2 from Graham <graham.clift@am.sony.com> ---
I think the mode='showing' approach is really a band-aid that helps but doesn't
solve all the problems. So maybe the starting point here is to define some of
the problems that I believe we need to solve:

Problem1: App needs to know whether the UA is already showing these captions by
itself. Currently the app can set mode='showing' and not know the result in the
UA.

Problem2: App needs to know whether the UA is capable of showing these captions
if requested to turn them on. There is no way interrogate the UA capabilities
in order to, say,allow for loading a captioning display library in advance. 

Problem3: App needs to know whether the platform supports native captioning in
one type and and whether it is capable of and whether it does convert these to
another format when presenting to JS. For example: A UA might be able to
leverage the platform's native display of CEA-708 captions when the video is
presented fullscreen but not in partial screen mode. Support for captioning in
the partial screen mode might be done by converting captions to WebVTT or TTML
cues in order to make use of the UA's native captioning ability.

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Received on Wednesday, 11 September 2013 18:27:27 UTC