I think he means something similar to what QuickTime broadcaster and quicktime streaming server does with a delay on a live stream or wowza media server with flash media encoder when using h.264, unless I am misunderstanding something. Is that correct Odin? Not sure how ice cast deals with it but I bet it's a similar issue,
Nikita Sent from my iPad On May 17, 2010, at 6:44 PM, David Singer <[email protected]> wrote: > > On May 17, 2010, at 14:31 , Odin Omdal Hørthe 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 Hørthe Omdal <[email protected]> >> http://velmont.no > > David Singer > Multimedia and Software Standards, Apple Inc. >
