W3C home > Mailing lists > Public > whatwg@whatwg.org > May 2010

[whatwg] Timestamp from video source in order to sync (e.g. expose OGG timestamp to javascript)

From: Odin Omdal HÝrthe <odin.omdal@gmail.com>
Date: Mon, 17 May 2010 23:31:41 +0200
Message-ID: <AANLkTimc8yt5bm8teHXZeHSyb9kEWdB0gtWOF2ejuhWT@mail.gmail.com>
Hello!

I filed bugs at mozilla and in chromium because I want to sync real
time data stream to live video. Some of them told me to send it here
as well. :-)

It's only possible to get relative playtime with html5 in javascript. I
want absolute timestamp that's embeded in OGG.

The spec only deals with relative times, and not getting out
information from the

Here's the deal:
I stream conferences using Ogg Theora+Vorbis using Icecast2. I have built a
site that shows the video and then automatically shows the slides (as PNG
files) as well. I use orbited (COMET) to have the server PUSH my ?next?
presses on my keyboard.

The problem is that icecast does heavy buffering, and also the client, so
that while I switch the slides, the browser will go from slide 3 to 4 WAY
too early (from 10 second to 1 minute).

If I could get the timestamp OR time-since-started-sending/recording from
the ogg file in javascript, I'd be able to sync everything.

There are multiple way to sync this, may even an stream with the slide-data
INSIDE the ogg file, however, AFAIK there's also no way of getting out such
arbitrary streams.

(PS: I had some problems, so sorry if you get this email many times! :-S)

--
Beste helsing,
Odin H?rthe Omdal <odin.omdal at gmail.com>
http://velmont.no
Received on Monday, 17 May 2010 14:31:41 UTC

This archive was generated by hypermail 2.4.0 : Wednesday, 22 January 2020 16:59:23 UTC