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It is imperative that the user interface indicate if and when captions and/or subtitles are available. For more details please see http://www.w3.org/WAI/PF/HTML/wiki/index.php?title=Media_Accessibility_Checklist#dac (a current work effort of the media sub-team of the Accessibility Task Force)
Surely this is something that should be left up to the UA? Not providing any visual indication would make the whole feature useless, so I doubt anyone will do that.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: no spec change Rationale: The spec already does this as much as it can: "This user interface should include features to [...] change the volume, change the display of closed captions or embedded sign-language tracks, select different audio tracks or turn on audio descriptions [...]"
The bug triage sub-team agrees with the editor, however since this is important adding the a11yTF keyword; John should follow-up and confirm if the spec text is agreeable.
Assigning to John for review