Re: Karaoke style ttml using sdp - by nino

Hi Nino,

Thanks for your report on this experiment.

Re: TTML support
The only browser that supports TTML is IE, which is why TTML files
won't play in any other browser.

Re: VTT support
Firefox and IE don't support the styling parts of VTT yet. It would be
good to follow up with them through bug reports.

Also, you say that you have worse results with VTT. Could you be more
specific? Maybe even register a bug on
for WebVTT to explain what you think is worse and what you didn't
understand in the specification?

Thanks for your help on this.


On Fri, Jan 9, 2015 at 3:41 AM, Nino Rilovic <> wrote:
> TTML Simple Delivery Profile for Closed Captions (US)
> A profile of TTML for internet delivery of Captions originated in the United
> States
> W3C Working Group Note 05 February 2013
> ---------------------------
> Good day. I want to thank you for clear writing article (specification)
> It took me two days to implement this solution as karaoke style subtitles
> in ttml format for HTML5 video tag. Sad it works only with Microsoft IE11.
> It took me three days to do same thing with vtt format with worse result
> and many things that I did not understood from their article
> (specification).
> Subtitles in vtt format:
> Karaoke style  working in Chrome, Opera, Safari,
> Firefox and IE will show only two lines, no formating
> -----------------------------------
> Subtitles in ttml format;
> Karaoke style working only in Microsoft Internet Explorer version 11
> all other browsers will not show subtitles (closed captions) at all
> regards, nino from Croatia

Received on Friday, 9 January 2015 05:51:03 UTC