multicat(1) Multicast equivalent of Netcat


multicat [-i <RT priority>] [-t <ttl>] [-p <PCR PID>] [-s <chunks>] [-n <chunks>] [-d <time>] [-a] [-S <SSRC IP>] [-u] [-U] [-m <payload size>] <input item> <output item>


Multicat is a 1 input/1 output application. Inputs and outputs can be network streams (unicast and multicast), files, character devices or FIFOs. It is thought to be a multicast equivalent of the popular netcat tool.

Multicat tries to rebuild the internal clock of the input stream; but it wants to remain agnostic of what is transported, so in case of files the said clock is stored to an auxiliary file (example.aux accompanies example.ts) while recording. Other inputs are considered "live", and the input clock is simply derived from the reception time of the packets.


Item format <file path | device path | FIFO path | network host>
Host format [<connect addr>[:<connect port>]][@[<bind addr][:<bind port>]]


-a Append to existing destination file (risky)
-d <time>
Exit after a definite time (in 27 MHz units)
-i <RT priority>
Real time priority
Show summary of options
-m <payload size>
Size of the payload chunk, excluding optional RTP header (default 1316)
-n <chunks>
Exit after playing N chunks of payload
-p <PCR PID>
-s <chunks>
Skip the first N chunks of payload
Overwrite or create RTP SSRC
-t <ttl>
TTL of the packets send by multicat
Source has no RTP header
Destination has no RTP header


multicat was written by Christophe Massiot.


This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation.

This manual page was written by RĂ©mi Duraffort <ivoire at videolan dot org>, for the Debian project (and may be used by others).