-config.js>

// Sets the preferred resolution (height) for local video. Defaults to 720.
// resolution: 720,
resolution: 480,

// w3c spec-compliant video constraints to use for video capture. Currently
// used by browsers that return true from lib-jitsi-meet's
// util#browser#usesNewGumFlow. The constraints are independent from
// this config's resolution value. Defaults to requesting an ideal aspect
// ratio of 16:9 with an ideal resolution of 720.
constraints: { 
   video: {  
      aspectRatio: 16 / 9,   
      height: {    
         ideal: 480,   
         max: 480,    
         min: 240     
      }      
   }     
},

// submit only video data from the last 9 speakers
channelLastN: 9,