Random issue: H.264 publish/subscription may be failed for Firefox 70

[wayunge]

environment: mcu :20191009 ubuntu43 browser: safari13.0.2 and firefox70 step: 1、user join room,and publish a simulcast stream with these option: option = { audio:true, video:h264, {rid:"f",active:true,scaleResolution:4.0}, {rid:"q",active:true,scaleResolution:2.0}, {rid:"h",active:true,scaleResolution:1.0} } results: 2、sub a forward stream with rid f or q only , can't sub and report errors 3、sub a forward stream with resolution(any value) only,can't sub and report errors 4、sub a forward stream with resolution(any value) and framerate 30,can't sub and report errors expect: sub a forward stream with rid only、 with resolution only、stream with resolution and framerate should be work well console log: