On Fri, 29 Aug 2025, Peter Enderborg via ffmpeg-devel wrote:
Two new options added for receive IPv6 multicast streams.
1 multicast_max_joins
2 multicast_interface
Change-Id: Ief0389815cff3edf26f7db5cbff033ce8bb24639
Signed-off-by: Peter Enderborg <[email protected]>
---
doc/protocols.texi | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/doc/protocols.texi b/doc/protocols.texi
index 6b582fde30..3def969dbe 100644
--- a/doc/protocols.texi
+++ b/doc/protocols.texi
@@ -1207,7 +1207,15 @@ This is a deprecated option. Instead,
@option{localrtpport} should be
used.
@item localaddr=@var{addr}
-Local IP address of a network interface used for sending packets or joining
+Local IP address of a network interface used for sending or receiving packets
or joining
+multicast groups.
+
+@item multicast_interface=@var{interfacename}
+Local IP address of a network interface used for receiving packets or joining
+multicast groups.
Why is this not simply "interface"? I would expect this option to be
interchangable with localaddr at least for ipv4, so the user can decide to
specify the interface by its ip address or its name.
+
+@item multicast_max_join=@var{n}
+Local IP address of a network interface used for receiving packets or joining
multicast groups.
This seems like unintended copy paste. What is the actual use case for
this option? How it is decided which additional interfaces are used for
multicast? How does this option relates to the localaddr and interface
options?
@item timeout=@var{n}
@@ -1229,6 +1237,13 @@ port will be used for the local RTP and RTCP ports.
@item
If @option{localrtcpport} (the local RTCP port) is not set it will be
set to the local RTP port value plus 1.
+
+@item
+On IPv6 the default receive behavior is using outgoing routing table for
selection of
+a interface for multicast streams. With @option{multicast_max_join} receiving
+can be added for multiple interfaces. With @option{multicast_interface} a
+interface is directly selected for receiving.
+
I guess this paragraph belongs to the earlier part.
@end enumerate
Please merge the documentation patch with corresponding feature patches.
Thanks,
Marton
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