Fine Granularity Scalability codec implementations

[allergique]

Hi all,
I'm serarching some implementation of Fine-Granularity-Scalability (FGS) codec (aka Multiple Description Coding, MDC) but I can't find almost anything except a lot of technical papers.
For who doesn't know FGS codec, rawly, With these codec you can split a media flow in more sub-stream. More stream you take, better is the audio/video quality.
Do you know where I can find some implementation of some coder with this feature?
I wonder why there are no coder available. Immature technology or infeasible specification?

Thank you,


L.

[benwaggoner]

I believe this is implemented in the Microsoft MPEG-4 reference code from many years past.

As to why no commercial implementations? In practice, it wound up being less efficient than Intelligent Streaming and SureStream.

[allergique]

As to why no commercial implementations? In practice, it wound up being less efficient than Intelligent Streaming and SureStream.
I think that could be very useful in a peer to peer application. Surestream use an "intelligent" simulcast but FGS are quite better for this kind of application.

[benwaggoner]

I think that could be very useful in a peer to peer application. Surestream use an "intelligent" simulcast but FGS are quite better for this kind of application.
I agree that some kind of "thinning" based codec could be very cool eventually, but the MPEG-4 Part 2 implementation is probably too weak for real-world use. A discreet band solution like WMV with Intelligent Streaming works much better in practice today.