FEC for getstream

[Frederik Kriewitz]

On Thu, Sep 30, 2010 at 10:15 AM, Denis Lackovic
<denis.lackovic at iskon.hr> wrote:
> 2. Unicast retransmission of missing packets - Cisco VQE is most
> popular solution for error correction in the IPTV world.
> They have many installations around the world.
>  This solution also requires Cisco VQE client on the STB - it is open
> source (Cisco sells server side equipment).
>
> This solution requires tv channels to use multicast UDP/RTP. When a
> packet is found missing on an STB, VQE client request a retransmission
> of a packet from VQE server - it knows exactly which packets are
> missing as it uses RTP sequence numbering.
>
> Server sends back required data using  unicast. This requires
> additional bandwidth on top of the tv channel bandwidth, but only at
> the time of retransmission.

I prefer RTP retransmissions over FEC too. Especially because it's
similar to RTP Bursts for rapid channel changing.
I looked into this topic some time ago, for me cisco's VQE seems to be
the way to.

RTP Retransmission specification: http://www.ietf.org/rfc/rfc4588.txt
VQE-Client reference implementation: ftp://ftp-eng.cisco.com/ftp/vqec/

Rapid synchronization related specs (I'm not sure how it's implemented by VQE):
http://tools.ietf.org/html/draft-ietf-avt-rapid-rtp-sync-12
http://tools.ietf.org/html/draft-versteeg-avt-rapid-synchronization-for-rtp-03
http://tools.ietf.org/html/draft-ietf-avt-rapid-acquisition-for-rtp-15


> Lately there are some other companies offering Cisco VQE based server
> side solutions (as the protocol itself is open).

Do you have some links for me? I couldn't find anything.
Anyone knows about an open source VQE-Server implementation?