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>