[vlc] Re: Videoconference solutions

[Albert Marti]

On 10/23/06, Sigmund Augdal Helberg <dnumgis at videolan.org> wrote:
>
> On Mon, 2006-10-23 at 14:28 +0200, Rubén Lagar wrote:
> > Hello,
> >
> > I am working for a French company, and we want to include a
> > videoconference application in our web site (it is a collaborative
> > site). For this, we have been testing VLC as solution. It works fine, we
> > get a better sound and video quality than Skype.
> >
> > The way we have done this is including a VLC activeX in the web page
> > that shows the remote WebCam. For streaming we use a java applet that
> > runs VLC from command line, and stream the local webcam to the remote
> > site. We have solved also NAT issues, so anyone can videoconference. As
> > I say, it is really good quality, and video and audio are fluid (we are
> > using H263 and MP3 codifications).
> >
> > We have just one problem, that may cause that we drop VLC as solution,
> > and this would make me really upset. We can not remove a 2 seconds delay
> > from the system, what makes conversation a pain. I have set to 0 almost
> > every cache paremeter that I know, and the 2 seconds dealy is still
> there.
> I think 0 is an invalid value for most caching options, and vlc will
> reset them to default if they are set to 0. I'd try to set the caching
> options to something like 20.
>
> Other options that may, or may not affect the delay:
> --sout-ts-shaping and --sout-ts-dts-delay (if you use mux=ts)
> --sout-ffmpeg-bframes and --sout-ffmpeg-keyint (if you use ffmpeg for
> encoding (which I guess you do)). Try setting bframes to 0 and keyint to
> 1 to get the lowest possible delay, then try increasing keyint and see
> if that improves quality without increasing delay (too much).
>
> Regards
>
> Sigmund
> >
> > I was wondering if any of the VLC developers could help me in locating
> > where is this delay located, to try to remove it.
> >
> > Thank you in advance,
> > Rubén.
> >
>
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Rubén.

my experience  tunning  vlc  using all possible parameters to drop the
latency is that you will always have at least around 800 - 900 ms. delay.
I also think that it is an architecture-related issue.

Regards
Albert
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