JSON message about configuration capability of sub stream of the windows
{
"MutiScreenSubStreamCap":{
"enabled":{
/*optional, boolean*/
"@opt":[true,false]
},
"winConutLimit":{
/*required, string,threshold number of divided windows. When the number of divided windows exceeds the threshold, streams of low performance will be used*/
"@opt":["1","4","6","8","9","16","32","64"]
}
}
}