On Wed, Aug 12, 2015 at 2:57 PM, Brian Baldino <brian@highfive.com >> <javascript:_e(%7B%7D,'cvml','brian@highfive.com');>> wrote:
> Yep, makes sense. So does the bridge allow an independent last-n
setting
> for audio so that, even in a large conference, only a subset of audio
> streams would be forwarded?
Right now we don't have any sort of audio last-n (we only do it for
video).
What the bridge does is drop muted channels on reception, so ideally
you would make sure on the app layer, that as many non-active users as
possible would end up muted.
In Meet we were thinking of having a maximum-allowed-non-muted feature.
Emil
>
> On Wed, Aug 12, 2015 at 11:32 AM, Emil Ivov <emcho@jitsi.org >> <javascript:_e(%7B%7D,'cvml','emcho@jitsi.org');>> wrote:
>>
>> Hey Brian,
>>
>> On Wed, Aug 12, 2015 at 10:58 AM, Brian Baldino <brian@highfive.com >> <javascript:_e(%7B%7D,'cvml','brian@highfive.com');>> >> >> wrote:
>> > A question inline
>> >
>> > On Wed, Aug 12, 2015 at 6:19 AM, Emil Ivov <emcho@jitsi.org >> <javascript:_e(%7B%7D,'cvml','emcho@jitsi.org');>> wrote:
>> >>
>> >> Hey Mihail,
>> >>
>> >> Answers inline:
>> >>
>> >> On Wednesday, August 12, 2015, Mihail Bratoev <mbratoev@gmail.com >> <javascript:_e(%7B%7D,'cvml','mbratoev@gmail.com');>> >> >> >> wrote:
>> >>>
>> >>> Hi,
>> >>>
>> >>> While developing an application that uses jitsi videobridge I have
>> >>> noticed that the video streams are relayed fine but the audio is
not
>> >>> delivered properly.
>> >>>
>> >>> In the implementation it is assumed that the bridge by default
mixes
>> >>> audio (in contrast to video which is relayed). The SSRC of each
bridge
>> >>> audio
>> >>> channel is signaled to the corresponding participant but the audio
>> >>> SSRC-s
>> >>> announced by the client are not propagated to all other
participants
>> >>> (just
>> >>> to the bridge itself). My understanding is that this would have
been
>> >>> sufficient if the above assumption is correct i.e. the bridge does
>> >>> actually
>> >>> mix the audio streams. Please confirm!
>> >>>
>> >>> However, observing the actual results I can infer that the
videobridge
>> >>> just relays the audio streams as it does with video.
>> >>>
>> >>> Having this in mind could you please provide some input on the
>> >>> following:
>> >>>
>> >>> 1. Does the latest videobridge support audio mixing?
>> >>
>> >>
>> >> Yes.
>> >>
>> >>>
>> >>> If yes, is this the default behavior
>> >>
>> >>
>> >> No
>> >>
>> >>>
>> >>> or it should be explicitly requested - e.g. by setting
>> >>> rtp-level-relay-type='mixer' attribute on the audio channel, etc.
>> >>
>> >>
>> >> Yes
>> >>
>> >>>
>> >>> The colibri protocol specification (https://jitsi.org/colibri/)
is not
>> >>> quite clear for me in this area...
>> >>>
>> >>> 2. In jitsi meet the audio is relayed. Am I correct?
>> >>
>> >>
>> >> Yes
>> >>
>> >>>
>> >>> Why it is not mixed? What are the benefits of having relayed audio
>> >>> channels - significant performance improvements?
>> >>
>> >>
>> >> Yes. Very significant. To the point that we are considering
abandoning
>> >> mixer support in the bridge.
>> >
>> > Does jitsi-meet support any mobile clients?
>>
>> We have been trying it on Chrome for Android and it's been quite
>> reasonable. I know some people are also using it with native clients
>> (which is also what we should have soon).
>>
>> > How many audio streams have you
>> > found are reasonable to send to mobile?
>>
>> I've seen things work pretty smoothly with 5 or 6 participants.
>>
>> > That's an area we've seen sending a
>> > pre-mixed stream is beneficial.
>>
>> One would think so yes. Still, our thinking so far has been that we
>> should rather try to avoid that even for constrained devices.
>>
>> A mobile device should be able to decently decode a few audio streams
>> without hitting performance issues and that's the maximum that also
>> works from a usability perspective.
>>
>> So the idea is that If you find yourself in a situation where your
>> mobile device is getting more than that then it would be better to try
>> and get out of that situation. Even if you managed to get the device
>> to render a mix of 15 pre-mixed streams and they are not mostly
>> silence then you are in trouble anyway.
>>
>> Does that make sense?
>>
>> Emil
>>
>>
>>
>>
>> >>
>> >>
>> >>>
>> >>> Will the dominant speaker recognition still work if the audio is
>> >>> mixed?
>> >>
>> >>
>> >> Not sure. Give it a try.
>> >>
>> >> Emil
>> >>>
>> >>>
>> >>> Thanks for all your support.
>> >>>
>> >>> Regards,
>> >>> Mihail
>> >>
>> >>
>> >>
>> >> --
>> >> sent from my mobile
>> >>
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>> >
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