[pulseaudio-discuss] Help with receiving multicast

[Jerry Geis]

Hi - Using ubuntu 20.04 LTS


I have this in my startup:
# Forward 11000 UDP to 9875 for pulse audio
socat UDP4-RECVFROM:11000,fork UDP4-SENDTO:localhost:9875 &

pacmd load-module module-null-sink sink_name=rtpsink format=s16be
channels=1 rate=44100
pacmd load-module module-rtp-recv sink=rtpsink sap_address=239.168.3.10

Doing netstat -g shows
IPv6/IPv4 Group Memberships
Interface   RefCnt Group
--- -- -
lo  1  224.0.0.251
lo  1  all-systems.mcast.net
eno11  239.168.3.10
eno11  224.0.0.251
eno11  all-systems.mcast.net
wlo21  all-systems.mcast.net
lo  1  ff02::fb
lo  1  ip6-allnodes
lo  1  ff01::1
eno11  ff02::fb
eno11  ff02::1:ff1f:6c0e
eno11  ip6-allnodes
eno11  ff01::1
wlo21  ip6-allnodes
wlo21  ff01::1

But I do not hear any audio when I multicast from asterisk. There is
another SIP speaker that receives the multicast but not my PC.

What am I not doing correct ?
Thanks

Jerry

Re: [pulseaudio-discuss] Help with receiving multicast

[Georg Chini]

Hi,

do you have a loopback from rtpsink.monitor to your default sink? The 
null sink

just discards the audio.
pactl load-module module-loopback source=rtpsink.monitor

Regards
   Georg

On 06.01.23 15:07, Jerry Geis wrote:

Hi - Using ubuntu 20.04 LTS


I have this in my startup:
# Forward 11000 UDP to 9875 for pulse audio
socat UDP4-RECVFROM:11000,fork UDP4-SENDTO:localhost:9875 &

pacmd load-module module-null-sink sink_name=rtpsink format=s16be 
channels=1 rate=44100

pacmd load-module module-rtp-recv sink=rtpsink sap_address=239.168.3.10

Doing netstat -g shows
IPv6/IPv4 Group Memberships
Interface       RefCnt Group
--- -- -
lo              1      224.0.0.251
lo              1 all-systems.mcast.net 
eno1            1      239.168.3.10
eno1            1      224.0.0.251
eno1            1 all-systems.mcast.net 
wlo2            1 all-systems.mcast.net 
lo              1      ff02::fb
lo              1      ip6-allnodes
lo              1      ff01::1
eno1            1      ff02::fb
eno1            1      ff02::1:ff1f:6c0e
eno1            1      ip6-allnodes
eno1            1      ff01::1
wlo2            1      ip6-allnodes
wlo2            1      ff01::1

But I do not hear any audio when I multicast from asterisk. There is 
another SIP speaker that receives the multicast but not my PC.


What am I not doing correct ?
Thanks

Jerry

Re: [pulseaudio-discuss] Help with receiving multicast

[Jerry Geis]

On Sat, Jan 7, 2023 at 5:09 AM Georg Chini  wrote:

> Hi,
>
> do you have a loopback from rtpsink.monitor to your default sink? The null
> sink
> just discards the audio.
> pactl load-module module-loopback source=rtpsink.monitor
>
> Regards
>Georg
>
> On 06.01.23 15:07, Jerry Geis wrote:
>
> Hi - Using ubuntu 20.04 LTS
>
>
> I have this in my startup:
> # Forward 11000 UDP to 9875 for pulse audio
> socat UDP4-RECVFROM:11000,fork UDP4-SENDTO:localhost:9875 &
>
> pacmd load-module module-null-sink sink_name=rtpsink format=s16be
> channels=1 rate=44100
> pacmd load-module module-rtp-recv sink=rtpsink sap_address=239.168.3.10
>
> Doing netstat -g shows
> IPv6/IPv4 Group Memberships
> Interface   RefCnt Group
> --- -- -
> lo  1  224.0.0.251
> lo  1  all-systems.mcast.net
> eno11  239.168.3.10
> eno11  224.0.0.251
> eno11  all-systems.mcast.net
> wlo21  all-systems.mcast.net
> lo  1  ff02::fb
> lo  1  ip6-allnodes
> lo  1  ff01::1
> eno11  ff02::fb
> eno11  ff02::1:ff1f:6c0e
> eno11  ip6-allnodes
> eno11  ff01::1
> wlo21  ip6-allnodes
> wlo21  ff01::1
>
> But I do not hear any audio when I multicast from asterisk. There is
> another SIP speaker that receives the multicast but not my PC.
>
> What am I not doing correct ?
> Thanks
>
> Jerry
>
>
>

interesting - I removed the null-sink line - rebooted and tested and it
worked.
so all I have now is:

# Forward 11000 UDP to 9875 for pulse audio
socat UDP4-RECVFROM:11000,fork UDP4-SENDTO:localhost:9875 &

pacmd load-module module-rtp-recv sink=rtpsink sap_address=239.168.3.10

Thanks for the suggestion!

Jerry