use-vbr vs adjust-bitrate in opus.conf.xml
in opus.conf.xml what is the difference between adjust-bitrate and use-vbr ? doesn’t variable bit rate (vbr) adjust the bitrate? or do you need both enabled for that to actually work? or do they contradict each other? Any info on this would be greatly appreciated and i would love to document the answer on confluence https://freeswitch.org/confluence/display/FREESWITCH/mod_opus
"use-vbr" will configure the encoder in VBR mode - which is the opposite of CBR . This happens once during the call, when the encoder is initiated, and the payload for each packet will have different sizes based on the audio input. "adjust-bitrate" enables a feature in FS that will pass certain information to the opus module during the call and the bitrate of the encoder will be modified based on packet loss / RTT . Dragos On Mon, Nov 2, 2020 at 3:18 PM E. Schmidbauer <eschmidbauer@gmail.com> wrote:
in opus.conf.xml what is the difference between adjust-bitrate and use-vbr ? doesn’t variable bit rate (vbr) adjust the bitrate? or do you need both enabled for that to actually work? or do they contradict each other? Any info on this would be greatly appreciated and i would love to document the answer on confluence https://freeswitch.org/confluence/display/FREESWITCH/mod_opus _________________________________________________________________________
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Thanks for the clarification! I'm curious about the implementation of `adjust-bitrate` How does freeswitch actually adjust the bitrate of a live call? Does freeswitch send a RE-INVITE w/ SDP changes or some other way that I cannot think of? Thanks, Emmanuel On Mon, Nov 2, 2020 at 1:49 PM Dragos Oancea <dragos@freeswitch.org> wrote:
"use-vbr" will configure the encoder in VBR mode - which is the opposite of CBR . This happens once during the call, when the encoder is initiated, and the payload for each packet will have different sizes based on the audio input. "adjust-bitrate" enables a feature in FS that will pass certain information to the opus module during the call and the bitrate of the encoder will be modified based on packet loss / RTT .
Dragos
On Mon, Nov 2, 2020 at 3:18 PM E. Schmidbauer <eschmidbauer@gmail.com> wrote:
in opus.conf.xml what is the difference between adjust-bitrate and use-vbr ? doesn’t variable bit rate (vbr) adjust the bitrate? or do you need both enabled for that to actually work? or do they contradict each other? Any info on this would be greatly appreciated and i would love to document the answer on confluence https://freeswitch.org/confluence/display/FREESWITCH/mod_opus _________________________________________________________________________
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@freeswitch.com https://freeswitch.com
Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users 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@freeswitch.com https://freeswitch.com
Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users https://freeswitch.com
It has nothing to do with RE-INVITE or SDP, it just increases/decreases the bitrate of the encoder dynamically based on a logic that takes into account an estimation of future loss and rtt and also sudden changes of these values - core tells the module what to do. Basically we try to make the difference between congestion and "slow link" and adjust the bitrate, we decrease slowly or we go to minimum bitrate. On Fri, Nov 6, 2020 at 4:01 PM E. Schmidbauer <eschmidbauer@gmail.com> wrote:
Thanks for the clarification! I'm curious about the implementation of `adjust-bitrate` How does freeswitch actually adjust the bitrate of a live call? Does freeswitch send a RE-INVITE w/ SDP changes or some other way that I cannot think of? Thanks, Emmanuel
On Mon, Nov 2, 2020 at 1:49 PM Dragos Oancea <dragos@freeswitch.org> wrote:
"use-vbr" will configure the encoder in VBR mode - which is the opposite of CBR . This happens once during the call, when the encoder is initiated, and the payload for each packet will have different sizes based on the audio input. "adjust-bitrate" enables a feature in FS that will pass certain information to the opus module during the call and the bitrate of the encoder will be modified based on packet loss / RTT .
Dragos
On Mon, Nov 2, 2020 at 3:18 PM E. Schmidbauer <eschmidbauer@gmail.com> wrote:
in opus.conf.xml what is the difference between adjust-bitrate and use-vbr ? doesn’t variable bit rate (vbr) adjust the bitrate? or do you need both enabled for that to actually work? or do they contradict each other? Any info on this would be greatly appreciated and i would love to document the answer on confluence https://freeswitch.org/confluence/display/FREESWITCH/mod_opus _________________________________________________________________________
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@freeswitch.com https://freeswitch.com
Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users 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@freeswitch.com https://freeswitch.com
Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users 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@freeswitch.com https://freeswitch.com
Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users https://freeswitch.com
participants (2)
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Dragos Oancea
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E. Schmidbauer