[Freeswitch-users] Distorted sound for one of conference members when AMR-WB codec used

[Dragos Oancea]

If you're sure it's not an issue with the client implementation open an
issue here:
https://github.com/signalwire/freeswitch/issues . Add pcap traces and FS
logs taken with "amrwb_debug on" (fs_cli).
What happens if a 3rd member is added to the conference ? Does the 3rd
member hear distorted audio too ?
If FS issue we need to figure out if the issue is on decoding or encoding.
When investigating be aware of the octet-align (OA) setting in SDP. It may
be an offer/answer issue when we get an BE stream but we decode OA.



On Fri, Sep 25, 2020 at 6:10 PM Rafał Telaczyński <
rafal.telaczynski at jtendo.com> wrote:

> Hi All,
>
> We are using FreeSWITCH to put 2 members on a conference and record it.
> The problem is that when AMR-WB codec is used, the second member to join
> the conference hears distorted sound(sometimes it lasts couple seconds, in
> some cases it lasts until the end of the call). There is no such sound
> heard by first member participant, nor is it generated by it(verified by
> decoding audio from RTP packets sent from first member participant towards
> FreeSWITCH). Moreover, distorted sound to second member can be heard after
> decoding RTP packets sent from FreeSWITCH towards second conference
> participant - proof that it is not the issue with second participant phone
> or so.
> Intrestingly, there is no such issue when AMR codec is used(tested by
> removing AMR-WB from global_codec_prefs) - the sound is clear for both
> participant throughout the whole duration of the conference.
>
> Considering that everything is OK with AMR codec used, it seems like the
> issue is not with conference itself, only using AMR-WB during conference.
> We tested with some of the FreeSWITCH parameters related to RTP(e.g.
> auto-rtp-bugs, rtp-rewrite-timestamps, send_silence_when_idle, etc.) but it
> did not help.
> Is it known issue? Did anyone faced something similar before? What else
> can be done to make it work? Please, let me know if you have any questions
> regarding the topic/need more info from my side.
>
> Thanks, Rafal
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