David, Most likely your mod_opus is configured to respect the remote's fmtp and not the maxaveragebitrate and maxplaybackrate that you configure. You have bitrate-negotiation set to true. It looks it's going in WB mode if you are sure it starts sending FEC at over 16 kbit/s . Value 14400 was chosen as config default only because is one step above 14000 which is one of the LBRR thresholds (Opus's bitrate works in steps of 400 bits/s) and it also provides a good compromis loss/audio quality for NB. https://github.com/xiph/opus/blob/master/silk/define.h#L52 /* LBRR thresholds */ #define LBRR_NB_MIN_RATE_BPS 12000 #define LBRR_MB_MIN_RATE_BPS 14000 #define LBRR_WB_MIN_RATE_BPS 16000 FEC threshold in FS is this: #define SWITCH_OPUS_MIN_FEC_BITRATE 12400 - one step above codec's LBRR threshold for NB. LBRR means Low Bit Rate Redundancy which means FEC. Regards, Dragos On Sat, Dec 18, 2021 at 3:06 AM David Villasmil < david.villasmil.work@gmail.com> wrote:
Hello all,
i've been testing FEC and how low we can go with maxavgbiterate
<param name="use-vbr" value="1"/> <param name="use-dtx" value="1"/> <param name="complexity" value="10"/> <param name="packet-loss-percent" value="15"/> <param name="asymmetric-sample-rates" value="1"/> <param name="bitrate-negotiation" value="1"/> <param name="keep-fec-enabled" value="1"/> <param name="use-jb-lookahead" value="true"/> <param name="maxaveragebitrate" value="14400"/> <param name="maxplaybackrate" value="8000"/> <param name="sprop-maxcapturerate" value="0"/> <param name="adjust-bitrate" value="1"/>
we only see FEC if we set maxavgbiterate to 18000, we see no FEC with 14400
anyone knows what i'm missing?
Regards,
David Villasmil email: david.villasmil.work@gmail.com phone: +34669448337 _________________________________________________________________________
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