- From: David Singer <singer@apple.com>
- Date: Mon, 17 May 2010 15:44:12 -0700
On May 17, 2010, at 14:31 , Odin Omdal H?rthe wrote: > 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). Buffering should not make any difference to how far into a stream a time means. If the transition from slide 3 to slide 4 happens at 10 minutes in, then as the presentation time ticks from 9:59 to 10:00 you should flip the slide. It doesn't matter how much data is in any buffers, does it? > > 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 David Singer Multimedia and Software Standards, Apple Inc.
Received on Monday, 17 May 2010 15:44:12 UTC