On Mar 22, 2007, at 2:09 AM, Dave Raggett wrote:
From an accessibility perspective the proposal lacks support for captioning. There should be a mechanism for enabling/disabling captions to avoid disadvantaging people who have difficulties with hearing the audio. It should further be possible to control the font size for captions to avoid disadvantaging people who don't find small font sizes intelligible. I don't think that the Web Accessibility folks will find the fall back text to be a compelling solution, and it is no longer acceptable to ignore accessibility.
Video can have timed text tracks, but we haven't yet proposed an API for controlling that other than a vague suggestion in open issues. Accessibility features in the UA itself could still allow global control of caption tracks per this spec.
p.s. the step function refers to frames but I was unable to find out whether the interface provides the current frame rate. This would appear to be an oversight.
The omission of frame rate is deliberate, since in many modern media formats frames are not a fixed duration. But even without defining a rate, it may still be possible to single-step frames and can be interesting for close inspection of video, either for video professional purposes or things like finding single-frame easter eggs.
Regards, Maciej
