[FFmpeg-devel] [PATCH] Document the SAP muxer

Martin Storsjo martin
Sat Oct 9 16:40:19 CEST 2010

 doc/protocols.texi |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 48 insertions(+), 0 deletions(-)

diff --git a/doc/protocols.texi b/doc/protocols.texi
index 88aedb9..05a7feb 100644
--- a/doc/protocols.texi
+++ b/doc/protocols.texi
@@ -287,6 +287,54 @@ To send a stream in realtime to a RTSP server, for others to watch:
 ffmpeg -re -i @var{input} -f rtsp -muxdelay 0.1 rtsp://server/live.sdp
 @end example
+ at section sap
+Session Announcement Protocol. This is not technically a protocol handler
+in libavformat, it is a muxer.
+It is used for signalling of RTP streams, by announcing the SDP for the
+streams regularly on a separate port.
+The syntax for a SAP url given to the muxer is:
+ at example
+ at end example
+The RTP packets are sent to @var{destination} on port @var{port},
+or to port 5004 if no port is specified.
+ at var{options} is a @code{&}-separated list. The following options
+are supported:
+ at table @option
+ at item announce_addr=@var{address}
+Specify the destination IP address for sending the announcements to.
+If omitted, the announcements are sent to the commonly used SAP
+announcement multicast address (sap.mcast.net), or
+ff0e::2:7ffe if @var{destination} is an IPv6 address.
+ at item announce_port=@var{port}
+Specify the port to send the announcements on, defaults to
+9875 if not specified.
+ at item ttl=@var{ttl}
+Specify the time to live value for the announcements and RTP packets,
+defaults to 255.
+ at item same_port=@var{0|1}
+If set to 1, send all RTP streams on the same port pair. If zero (the
+default), all streams are sent on unique ports, with each stream on a
+port 2 numbers higher than the previous.
+VLC/Live555 requires this to be set to 1, to be able to receive the stream.
+ at end table
+Example command lines:
+To broadcast a stream on the local subnet, for watching in VLC:
+ at example
+ffmpeg -re -i @var{input} -f sap sap://
+ at end example
 @section tcp
 Trasmission Control Protocol.

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