[Freeswitch-users] Conference vs codec sample rate and CPU

[Oleg Stolyar]

My endpoint is Chrome/WebRTC.  Here is what the current version sends in
the the INVITE.

Doesn't look like G722/16000 is there.  How is ISAC in terms of CPU
consumption?

a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10; useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:126 telephone-event/8000


On Tue, Oct 6, 2015 at 1:49 PM, Stanislav Sinyagin <ssinyagin at gmail.com>
wrote:

> If your endpoint supports it, G722 at 16000h gives a very decent voice
> quality. SILK also supports 16KHz.
>
> here's some information related to codec complexity:
>
> https://txlab.wordpress.com/2015/04/10/testing-freeswitch-performance-on-scaleway-c1/
>
>
>
> On Tue, Oct 6, 2015 at 10:40 PM, Oleg Stolyar <olegstolyar at gmail.com>
> wrote:
>
>> Thanks guys!
>>
>> Anthony, using your suggestion means that I won't have HD voice,
>> correct?  HD voice is the primary reason I am considering OPUS instead of
>> G.722.
>>
>> Is there some codec/setting that will let me have HD voice for less CPU
>> and perhaps more bandwidth?
>>
>> It's not a must - I can scale up if needed, just wondering.
>>
>> On Tue, Oct 6, 2015 at 1:35 PM, Anthony Minessale <
>> anthony.minessale at gmail.com> wrote:
>>
>>> typo: opus at 8000h@20i
>>>
>>> On Tue, Oct 6, 2015 at 3:33 PM, Stanislav Sinyagin <ssinyagin at gmail.com>
>>> wrote:
>>>
>>>> OPUS is an expensive codec, so any conversion between OPUS and
>>>> uncompressed audio is CPU-consuming. I don;t think that resampling
>>>> would play much of a role in CPU consumption.
>>>>
>>>> On Tue, Oct 6, 2015 at 10:29 PM, Oleg Stolyar <olegstolyar at gmail.com>
>>>> wrote:
>>>> > Hi guys,
>>>> >
>>>> > I have a bunch of conferences on my FS.  Users are either G.711/8000
>>>> or
>>>> > G.722/8000.  Conference sample rate is set to 8000.
>>>> >
>>>> > When I switched some users to OPUS instead, the CPU consumption
>>>> jumped 3-4
>>>> > times even though the conference rate is still 8000.  Is this
>>>> expected?
>>>> >
>>>> > I was hoping to be able to save some CPU by setting the conference
>>>> sample
>>>> > rate to auto (so it only used high-quality sampling for users that can
>>>> > support it)  but it seems it won't work.  Any ideas?
>>>> >
>>>> >
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>>>
>>>
>>> --
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>>
>>
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>
>
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