Implementation of VP8/WebM in XMPP video chat

[Matevž Jekovec]

Let me add my 2 euro cents. ;)

My name is Matevž and I'm a 24 years old computer science student. I was 
also at the hacking weekend mainly focusing at the multi-user conference 
calls for jingle (MUJI). The specifications are all in XEP-0272 
(http://xmpp.org/extensions/xep-0272.html). We also took the python's 
prototype MujiDemo for telepathy as an example 
(http://blogs.gnome.org/danni/2010/06/07/muji-multi-user-jingle/).

The main problem we encountered is the bandwidth use - MUJI doesn't 
define (see the last paragraph of XEP-0272) the centralized audio/video 
relay, but it's all p2p. This means that for 4 users, each user sends 
and receives 3 streams, which is a major problem for anything else than 
FTTx fiber internet connection or the local network.


Regards.
-Matevž

ps. Been also helping other teams out. We successfully compiled Pidgin 
with gstreamer on windows, but the VV was not working yet. We didn't 
investigate further (there was <error> stanza in XMPP console), but we 
assumed that the gstreamer was too old. Only windows packages built on 
Oct 09 were available. Compiling the gstreamer (+35 dependencies) by 
ourselves was not an option :/
You can get the compilable version for windows at our SVN repository:
http://jekovec.net/svn/pidgin

We mainly added and changed Makefile.mingw to enable VV and include the 
farsight/gstreamer stuff.

Na 23. 08. 2010 19:30, Alec Smrekar je pisal:
> Hi,
>
> My name is Alec and I need some help with implementing VP8/WebM in 
> XMPP video chat. I'm 16 and I'm learning C++, so I understand most of 
> the code. With my friends we decided to have a coding weekend and we 
> also posted something about it here 
> <http://pidgin.im/pipermail/devel/2010-August/009761.html>. We set to 
> ourselfs 3 main goals:
>
> - implementing WebM to XMPP video chat
> - Audio/video support for Windows
> - implement conference/multiuser video chat
>
> I worked on WebM. To understand how 2 users comunicate between them we 
> analyzed the output in the XMPP console(in xml) after the video chat 
> was established.
>
> After that we went searching the code for something that would explain 
> us where the available codecs are found in how the codec used is 
> choosen. We spent a hell lot of time for this search but we didn't 
> find anything. We would still need information about how the codecs 
> are found and where.
>
> For the WebM support we updated ffmpeg to version 0.6 
> <http://www.ffmpeg.org/download.html#release> and gstreamer to version 
> 0.10.30 <http://gstreamer.freedesktop.org/src/gstreamer/>. After that 
> we checked the XMPP console again, but again there was no sign of 
> WeM/VP8 support.
> We suspect that libpurple has outdated information about available 
> codecs, but again, we didn't find the piece of code where libpurple 
> defines/lists the codecs. We would really need some help with that.
>
> Wouldn't it be great to hear that Pidgin(XMPP) has WebM support? :)
>
> Alec Smrekar
>

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