How is Connection Quality indicator decided? (Green, Yellow, Red)

mehtapaxshal · April 21, 2023, 6:46pm

Hey community,

Any one knows how different connectivity indicator is decided (Green, Yellow, Red)? I went through code; especially lib-jitsi-meet, however there’s lot in there in determining the percentage for connectivity.

Do we have a quick short answer on what plays a major role in deciding the connectivity?

(new values: 0-9% - red, 10-29% - yellow, 30%+ - green)

Any response is appreciated here. Thanks!

damencho · April 21, 2023, 7:44pm

It is based on upload bitrate for the current resolution that is used to upload video for. And also the reported packet loss.
When there is no video it is just the packet loss.
This is in general.

github.com

jitsi/lib-jitsi-meet/blob/7e6fde2700d8057387a997dcd772eda2b5823eaa/modules/connectivity/ConnectionQuality.js#L357


      
                  let target = getTarget(isSimulcastOn, resolution, millisSinceStart, videoQualitySettings);
          
          
        target = Math.min(target, MAX_TARGET_BITRATE);
          
          
        // Calculate the quality only after the stats are available (after video was enabled).
                  if (millisSinceStart > statsInterval) {
                      quality = 100 * this._localStats.bitrate.upload / target;
                  }
              }
          
          
    // Whatever the bitrate, drop early if there is significant loss
              if (packetLoss && packetLoss >= 10) {
                  quality = Math.min(quality, 30);
              }
          }
          
          
// Make sure that the quality doesn't climb quickly
          if (this._lastConnectionQualityUpdate > 0) {
              const maxIncreasePerSecond = 2;
              const prevConnectionQuality = this._localStats.connectionQuality;
              const diffSeconds = (window.performance.now() - this._lastConnectionQualityUpdate) / 1000;

mehtapaxshal · April 25, 2023, 6:46pm

Thanks Damien.

Interestingly. We are seeing red connectivity tiles most of the time on our calls. Both for video and without video cases. Moreover, we don’t really see obvious issue with viewing video of the remote user whose tile shows red connectivity.

Also, packet loss is always showing 0% in all cases below. Any idea, what’s going on here and what can be done to improve the experience? (The red icons are really annoying as it shows up for most of the tiles for us)

jallamsetty · April 27, 2023, 4:41pm

@mehtapaxshal Do you have any customizations around maxBitrates ? Do you have bitrate settings under config.videoQuality by any chance ?

mehtapaxshal · April 27, 2023, 6:50pm

Yes, we do have it set. Is that what may be causing/limiting this? Is there any recommendation here?

// P2P preferred codec
// enable preffered video Codec
if (!config.hasOwnProperty('videoQuality')) config.videoQuality = {};
config.videoQuality.preferredCodec = 'VP9';
config.videoQuality.enforcePreferredCodec = false;

if (!config.videoQuality.hasOwnProperty('maxBitratesVideo')) config.videoQuality.maxBitratesVideo = null;
config.videoQuality.maxBitratesVideo = config.videoQuality.maxBitratesVideo || {}
config.videoQuality.maxBitratesVideo.VP9 = { low: 200000, standard: 500000, high: 1500000 };

            - name: RESOLUTION
              value: "480"
            - name: VIDEOQUALITY_PREFERRED_CODEC
              value: "VP9"
            - name: VIDEOQUALITY_BITRATE_VP9_LOW
              value: "200000"
            - name: VIDEOQUALITY_BITRATE_VP9_STANDARD
              value: "500000"
            - name: VIDEOQUALITY_BITRATE_VP9_HIGH
              value: "1500000"

mehtapaxshal · April 28, 2023, 6:15pm

Any recommendations? @jallamsetty

jallamsetty · May 1, 2023, 3:59pm

Can you also add maxBitrates for VP8 ? FYI, these are the values configured on our meet.jit.si deployment.

maxBitratesVideo: {
        VP8: {
            low: 200000,
            standard: 500000,
            high: 1500000
        },
        VP9: {
            low: 100000,
            standard: 300000,
            high: 1200000
        }
    },

mehtapaxshal · May 1, 2023, 5:17pm

I see.

we didn’t set anything for VP8. If we set preferred codec to VP9, are we suppose to set VP8 then?

Also, Let me use the meet.jit.si values on our end.

jallamsetty · May 1, 2023, 6:20pm

Even if you set VP9 as the preferred codec, the call may fallback to VP8 when endpoints that don’t support VP9 properly join the call (Safari and Firefox) since you have enforcePreferredCodec=false

mehtapaxshal · May 1, 2023, 6:22pm

Ohk got it now. Thanks!

In that case, I will set the maxBitrates for VP8 as well (probably similar to meet.jit.si) and try it out.