mediastreamtrack_control_bandwidth.md

MediaStreamTrack control bandwidth

Enviroment

site: webrtc-sample (bandwidth)
browser: Chrome, Firefox

stop encoding

// https://stackoverflow.com/a/77364499/22575350
const pause=()=>{
    pc1.getSenders().forEach(sender=>{
        console.log(sender.track.kind+' pause');
        const parameters=sender.getParameters();
        parameters.encodings[0].active=false;
        sender.setParameters(parameters);
    });
};

const resume=()=>{
    pc1.getSenders().forEach(sender=>{
        console.log(sender.track.kind+' resume');
        const parameters=sender.getParameters();
        parameters.encodings[0].active=true;
        sender.setParameters(parameters);
    });
};

(←: Bitrate, →: Packets sent per second)

Warning

Firefox doesn't stop audio encoding and send packets even when the audio track's encoding parameter is disabled. This is only seen in the audio track. Video track works fine with this approach.

replace track with empty frame

const pause=()=>{
    pc1.getSenders().forEach(sender=>{
        console.log(sender.track.kind+' pause');
        sender.track.enabled = false;
    });
};

const resume=()=>{
    pc1.getSenders().forEach(sender=>{
        console.log(sender.track.kind+' resume');
        sender.track.enabled = true;
    });
};

change min / max bitrate