NAME
poc-fec - send FEC MP3 streams
SYNOPSIS
poc-fec [ -s address ] [ -p port ] [ -t ttl ] [ -q ] [ -k fec_k ] [ -n
fec_n ] files...
DESCRIPTION
poc-fec is a streaming server sending mp3 data using a custom FEC
protocol. The streamed MP3 frames are first decomposed in autonomous
data units (ADUs). These ADUs are grouped into ADU groups, which are
encoded redundantly using a FEC method by Luigi Rizzo. A group of k
ADUs is encoded as n data packets. Any k of these n data packets is
sufficient to recover the original k ADUs. It sends the files in the
order given on the command-line. Use the filename - to stream from
standard input. Normally, the FEC protocol is used to stream to
multicast groups.
OPTIONS
-s address
Specify the address to send to (default 224.0.1.23).
-p port
Specify the port to send to (default 1500).
-t ttl Specify the TTL parameter to be set on outgoing parameters
(default 1).
-q Don’t output any information on standard error.
-k fec_k
Specify the number of ADUs that will be encoded as an ADU group
(default 20).
-n fec_n
Specify the number of packets that the ADU groups will be
encoded to (default 25). This number must be greater than the
fec_k parameter.
EXAMPLES
poc-fec -s 224.0.1.24 -p 8989 -t 2 -k 16 -n 32 bla.mp3
Send the file bla.mp3 using the RTP RFC fec protocol to the
address 224.0.1.24 on port 8989, and set the TTL to 2. MP3
frames of bla.mp3 are converted to ADUs and grouped in ADU
groups of 16 ADUs. These 16 ADUs are encoded into 32 packets and
streamed. A client will have to receive at least 16 packets to
recover the original ADUs.
AUTHORS
Manuel Odendahl <manuel@bl0rg.net>, Florian Wesch <dividuum@bl0rg.net>
February 2005