is an audio conference.

what I would look into is something on these lines: have a conference with only the speakers. Put the listeners on music on hold, and use the conference output as music on hold stream. Give the listeners a bind meta key for being connected to the conference if they need to speak.

-giovanni

On 20 April 2018 at 21:45, Madovsky <infos@madovsky.org> wrote:

Latency is often caused by buffer and high quality video.

if you really need zero latency so find a way to set the buffer stream to zero and use

a very fast video encoding.
On 4/20/2018 10:29 AM, Abaci B wrote:
I do understand that the way mod_conference work it is not efficient for my use case, my question is about the best alternative.

Streaming would be ideal if it wouldn't be for the latency, since users need to be able to switch to talk mode there is no way a latency of 5-10 seconds (or possibly more) is acceptable.

Another option is to use eavesdrop which I plan on testing next week to see if it scales, if someone has any input on it I would appreciate.

The next option would be to optimize mod_conference for this use case, I started looking at the code and identified some places that performance can be optimized but may need to hire someone with better C skills to do the actual coding.

another possibility may be, to use an RTP proxy that would just distribute the RTP to all callers, this would give the best performance but would limit features.
Last option would be to develop a new module optimized for low latency streaming, but leave that as a last resort.

On Fri, Apr 20, 2018 at 1:15 PM, Tihomir Culjaga <tculjaga@gmail.com> wrote:

a conference with 1000 members demands huge resources... and this is not efficient if only 2-5% of members will actually talk.
you need to keep the actual conference to the minimum number of "speakers" and move listeners to a streaming "service".

so, focus on how to get your entire conference streamed somewhere.

another thing to consider.... do the "listeners" really need to be in time sync with the conference ? They will just hear the conversation from the conference a bit later... thats all.

T.

On 20 April 2018 at 14:43, Abaci B <abaci64@gmail.com> wrote:

problem with shoutcast streaming is the extreme latency

On Fri, Apr 20, 2018 at 1:30 AM, Giovanni Maruzzelli <gmaruzz@gmail.com> wrote:

you definitely want to have only the speakers into conference, and stream to all others.

-giovanni

On 19 April 2018 at 23:37, Abaci B <abaci64@gmail.com> wrote:

I was thinking that the muted flag (CAN_SPEAK?) is something that can change mid conference which means there is a chance of loosing a single frame (the last one right before muting). I was more interested in knowing as far as performance if it makes sense.

not sure if this is safe but something like only starting conference_loop_launch_input if that flag is not set.

I still wish there would be module that would do exactly this (something like shoutcast but local and without the shoutcast latency)

On Thu, Apr 19, 2018 at 5:19 PM, Steven Ayre <steveayre@gmail.com> wrote:

There's already a muted flag you could use for that.

On 19 April 2018 at 20:55, Abaci B <abaci64@gmail.com> wrote:

Thanks for the reply.

Another idea I'm thinking of is to add a LISTEN_ONLY mflag to mod_conference and only run conference_loop_input thread on channels that don't have this flag, that way I don't need to set up a shoutcast server and have everything contained within freeswitch, does that make sense?

On Thu, Apr 19, 2018 at 3:20 PM, Giovanni Maruzzelli <gmaruzz@gmail.com> wrote:

definitely conference with two participant, and 598 on localstream

-giovanni

On Thu, Apr 19, 2018, 18:38 Abaci B <abaci64@gmail.com> wrote:

Hi,
I'm trying to set up a large audio conference of over 1000 users where only 1 or 2 users are talking and the rest are just listening, but after 600-700 users the CPU usage gets too high and the audio gets choppy, I understand that mod_conference is not optimized for my use case but was wondering if someone has any suggestions on what can be done to optimize for my use case.
I was also thinking that maybe there is a better alternative for what I look for, such as having just the talkers on the conference and the listeners should listen to it via mod_local_stream or maybe use something like eavesdrop for the listeners but not sure if and how much performance I would gain.

Thanks for any help or input

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