[Freeswitch-users] L16 Codec in mod_conference

Fri Nov 15 04:10:29 UTC 2019

Thanks for your reply.

However we had found the audio quality under conference mod is not as good as bridge mode, though both OPUS.
I wonder if this issue has any relations on L16 or not.

Regards.

> 在 2019年11月15日，00:54，Dragos Oancea <dragos at freeswitch.org> 写道：
> 
> Your issue does not have anything to do with L16 per se, and you cannot disable it for mod_conference. Everything is decoded into L16 / encoded from L16, like all audio codecs do. 
> A conference is more CPU intensive than a bridge.
> 
> On Thu, Nov 14, 2019 at 9:43 AM 王聡 <cong.wang.itsherpa at gmail.com <mailto:cong.wang.itsherpa at gmail.com>> wrote:
> Perhaps 48000, from uuid_dump:
> 
> variable_rtp_use_codec_rate: 48000
> 
> Regards.
> 
>> 在 2019年11月14日，04:25，Mike Jerris <mike at freeswitch.org <mailto:mike at freeswitch.org>> 写道：
>> 
>> What rate is your conference running at?
>> 
>>> On Nov 12, 2019, at 6:49 PM, 王聡 <cong.wang.itsherpa at gmail.com <mailto:cong.wang.itsherpa at gmail.com>> wrote:
>>> 
>>> Hey all,
>>> 
>>> I’m trying to transfer my ivr system from bridge to conference for more function. The simple conference ivr likes:
>>> 
>>> session:execute("pre_answer")
>>> session:execute("conference_set_auto_outcall", "user/" .. args.call_user)
>>> session:execute("conference", "testroom at default")
>>> 
>>> My FreeSWITCH server is configured to accept only opus for audio codec, and it worked well on bridge mode. The uuid_dump showed:
>>> 
>>> variable_rtp_use_codec_string: OPUS,H264,H263-1998,VP8
>>> variable_rtp_use_codec_name: opus
>>> variable_rtp_use_codec_fmtp: useinbandfec%3D1
>>> variable_rtp_use_codec_rate: 48000
>>> variable_rtp_use_codec_ptime: 20
>>> variable_rtp_use_codec_channels: 1
>>> variable_rtp_last_audio_codec_string: opus%4048000h%4020i%401c
>>> variable_original_read_codec: opus
>>> variable_write_codec: opus
>>> variable_read_codec: opus
>>> 
>>> But after I modified my ivr into conference, the read_codec turned into L16. Uuid_dump showed:
>>> 
>>> variable_rtp_use_codec_string: OPUS,H264,H263-1998,VP8
>>> variable_rtp_use_codec_name: opus
>>> variable_rtp_use_codec_fmtp: useinbandfec%3D1
>>> variable_rtp_use_codec_rate: 48000
>>> variable_rtp_use_codec_ptime: 20
>>> variable_rtp_use_codec_channels: 1
>>> variable_rtp_last_audio_codec_string: opus%4048000h%4020i%401c
>>> variable_original_read_codec: opus
>>> variable_write_codec: opus
>>> variable_read_codec: L16
>>> 
>>> Both tests are based on Linphone offical app. 
>>> During test, the audio quality has a significant loss on conference mode compared with bridge, perhaps due to L16 codec.
>>> Is there any solutions for this situation? I wonder if I can disable L16 on my server, or force the codec to opus in conference.
>>> Any suggestion would be appreciated.
>> 
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> _________________________________________________________________________
> 
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com <https://signalwire.com/>
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
> Build your next product on our scalable cloud platform.
> 
> Join our online community to chat in real time https://signalwire.community <https://signalwire.community/>
> 
> Professional FreeSWITCH Services
> sales at freeswitch.com <mailto:sales at freeswitch.com>
> https://freeswitch.com <https://freeswitch.com/>
> 
> Official FreeSWITCH Sites
> https://freeswitch.com/oss <https://freeswitch.com/oss>
> https://freeswitch.org/confluence <https://freeswitch.org/confluence>
> https://cluecon.com <https://cluecon.com/>
> 
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> https://freeswitch.com <https://freeswitch.com/>_________________________________________________________________________
> 
> The FreeSWITCH project is sponsored by SignalWire https://signalwire.com
> Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services.
> Build your next product on our scalable cloud platform.
> 
> Join our online community to chat in real time https://signalwire.community
> 
> Professional FreeSWITCH Services
> sales at freeswitch.com
> https://freeswitch.com
> 
> Official FreeSWITCH Sites
> https://freeswitch.com/oss
> https://freeswitch.org/confluence
> https://cluecon.com
> 
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