- From: Cyril Concolato <cyril.concolato@telecom-paristech.fr>
- Date: Wed, 25 Jul 2012 16:18:07 +0200
- To: public-texttracks@w3.org
Hi all, I'm trying to integrate WebVTT content in streaming context (MP4, RTP, DASH, MPEG-2 ...) in general. Aside from the problem of random access points that I mentionned in my previous email [1], there is a problem with the fact that the "WEBVTT" string has to be at the beginning of the file. Consider the following case, I have a live event and I want client to connect to an HTTP-delivered WebVTT resource, I'd like to update that resource from time to time (removing old cues, adjusting times and adding new cues) and enable both clients already connected to get the update and for new clients to get the new content. That same file has to have the "WEBVTT" string for new clients, but cannot be used as is for the already connected client (I'll have to strip off the "WEBVTT" string). What is the use of that string? Is it really needed given that many resources on the web don't use magic numbers (HTML, XML, SRT, SVG, ...)? Thanks, Cyril [1] http://lists.w3.org/Archives/Public/public-texttracks/2012Jul/0000.html -- Cyril Concolato Maître de Conférences/Associate Professor Groupe Multimedia/Multimedia Group Telecom ParisTech 46 rue Barrault 75 013 Paris, France http://concolato.wp.mines-telecom.fr/
Received on Wednesday, 25 July 2012 14:18:45 UTC