[icecast] seek, pause etc using icecast ?
msmith at xiph.org
Wed Sep 3 18:41:34 PDT 2003
On Thursday 04 September 2003 08:20, W. Kevin Pedigo wrote:
> On Wed, 2003-09-03 at 21:58, Erlend Simonsen wrote:
> > Hirendra Hindocha <hiren_hindocha at comcast.net> writes:
> > >> No. icecast2 is a streaming server, so it... streams.
> > >
> > > Good point. I wonder how the other servers (Real Server ,Quicktime etc)
> > > do it. Any inputs on any other streaming servers that lets a client
> > > seek/fast forward /rewind ?
> > They probably do it client side by buffring the stream.
> No, they do it using RTSP methods, which inherantly contain the correct
> "time" for the frame. By requesting a specific "time", you get a the
> frames that correspong, thus you can seek without relying on client side
> buffering. Note that not all QuickTime or RealMedia files are served by
> proper streaming servers. You need two things for server side
> seeking.... a seekable source, and a seek-aware protocol. If all you
> want to do is get the file to the client, HTTP works just fine. And
> while the file, when it arrives, will be seekable, HTTP doesn't
> understand seeking, so downloading quicktime files off an HREF from a
> web page doesn't get you all the cool goodies that RealServer or the
> Darwin Streaming Server get you. Which is why they invented the "embed"
Well, this is mostly right... but seeking with HTTP is entirely possible
However, you have to build it up from byte-range 'seek' requests, not using a
time-offset. This makes doing it efficiently quite difficult.
That's what the Range header is for.
See also http://www.annodex.net/TR/uri_fragments.html for an internet-draft
attempting to specify a media-and-transport-neutral way of specifying this
sort of thing. I think they have an apache module implementing it as a
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