Re: [GnomeMeeting-list] Dirac video codec released by the BBC under the GPL

[Derek Smithies <derek indranet co nz>]

Hi,
 yes, the dirac video codec has been released.

I wrote to the Dirac people, and Tim Borer was very helpful in his 
responses.

Sadly, Dirac is not ready for the big time of voip/telephony.
Issues are
 1)The latency may be too high. It can run with different levels of 
   latency (2 frames in the buffer, or many more). With just 2 frames in 
   the buffer, they do not know what the compression stats are. (they do
   not work at this end - they work with lots of frames, going for big 
   time compression)

2)It is an evolving codec and api. I write the h323 interface, and then 
  they change the codec. gack. I then have to redo my work.

3)dropped packets in the network are a problem. Now, I have written code 
  to cope with this before, but, well, I have to resurrect it and get it 
  working again.

Derek.


 On Thu, 13 May 2004, Jean-Michel POURE wrote:

> Dear all,
> Just for information, the BBC released the DIRAC video codec recently.
> It can be found here: http://sourceforge.net/projects/dirac
> 
> Dirac is a general-purpose video codec aimed at resolutions from QCIF 
> (180x144) to HDTV (1920x1080) progressive or interlaced. It uses wavelets, 
> motion compensation and arithmetic coding and aims to be competitive with 
> other state of the art codecs.
> 
> Cheers,
> Jean-Michel
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