Fast Recovery is accomplished by enabling forward error
correction (FEC) on a publishing
point. With the help of FEC, Windows Media Player
can usually recover lost or damaged data packets
without having to request that the data be resent by the Windows
Media server. In environments that are subject to latency problems,
such as satellite networks and other wireless networks, this
process of receiving data is much more efficient. You can specify
the amount of error correction data transmitted per span of data
sent on the Forward Error Correction properties sheet.
Forward error correction can only be used with
players that connect to your server through the RTSPU
The Fast Recovery feature is only used by
clients that connect to a unicast stream.
Users may develop customized players that
request FEC data packets. If you have not specified a number for
the FEC packets per span setting, the server will attempt to
deliver the amount of FEC data requested by the player. Excessive
FEC data requests can cause the server's processor to be overloaded
and may result in poor server performance. If you notice that the
processor use is out of the normal range, set the FEC packets
per span setting to a lower number.
Fast Recovery is available only if Windows Media
Services 9 Series is running on the following editions of the
operating system: Windows Server 2003, Enterprise Edition and
Windows Server 2003, Datacenter Edition. If you are running Windows
Server 2003, Standard Edition, this feature is not supported.