W3C home > Mailing lists > Public > public-texttracks@w3.org > November 2011

Re: Roll-up captions in WebVTT

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Tue, 29 Nov 2011 10:39:00 +1100
Message-ID: <CAHp8n2npMpszHJ=Z22Xzm0R_pa5Lf_OTChes3KmjDiKwqvkxwA@mail.gmail.com>
To: Christian Vogler <christian.vogler@gallaudet.edu>
Cc: Ian Hickson <ian@hixie.ch>, public-texttracks@w3.org
On Tue, Nov 29, 2011 at 10:36 AM, Christian Vogler
<christian.vogler@gallaudet.edu> wrote:
>> That's like ten times more annoying to read than the normal captions on
>> that video. I think if we are to support roll-up captions we need a far
>> more convincing use case.
>
> Two points in response:
>
> 1. Roll-up captions are essential for live captioning where the text
> is transmitted as the captioner types, especially when steno errors
> and subsequent corrections are factored in.  Another issue is the
> sheer number of words per minute during live captioning, where without
> roll-up you would end up missing the context half of the time. This
> usage scenario is very common during live broadcasts in the United
> States, where captions are not only roll-up, but also appear word by
> word, instead of line by line. I'll check around if I can find a video
> clip that shows this clearly.
>
> 2. The implementation of roll-up in this video is poor. The
> positioning and alignment jumps around with every roll up, which of
> course makes it very hard to read.
>
> Now come to think of it, a corollary is that roll-up support by itself
> is not sufficient. You also need a way to paste on captions live word
> by word for it to be truly useful.

WebVTT has support for the paint-on style with the time markers. Every
word can be revealed at a different time.

Silvia.
Received on Monday, 28 November 2011 23:39:50 UTC

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