I'm capturing screen by using media recorder and making video from blob but that video is not showing it's duration

Question

I'm capturing screen by using media recorder and making video from blob but that video is not showing it's duration i have tried all way but not able to get the duration. I used get getID3(PHP) but not working i used many other ways but only one way works for me which where two steps i have defined below:|

var vid = document.createElement("video");
vid.src = url;
object.addEventListener("loadedmetadata", function() {
                                if(vid.duration === Infinity) {
                                    vid.currentTime = 1000000000; 
                                }  
                            });

                            var duration = 0;
                            var speed_factor = 0.0;
                            object.addEventListener("timeupdate", function() {
                                duration = vid.duration;
                                if(duration <= 10.0)
                                {
                                    speed_factor = 1.0;
                                }else if(duration <= 30.0)
                                {
                                    speed_factor = 1.5;
                                }else if(duration <= 60.0)
                                {
                                    speed_factor = 2.0;
                                }else if(duration <= 120.0)
                                {
                                    speed_factor = 3.0;
                                }else if(duration <= 180.0)
                                {
                                    speed_factor = 4.0;
                                }else if(duration <= 240.0)
                                {
                                    speed_factor = 5.0;
                                }else{
                                    speed_factor = 10.0;
                                }
                                $("#source1").attr("src", url);
                                $("#source2").attr("src", url);
                                
                                $("#videoplayer").get(0).defaultPlaybackRate = speed_factor;
                                console.log("The video duration is "+ duration+" and speed factor is "+speed_factor);

                                $('#videoplayer').get(0).load();
                                $('#videoplayer').get(0).play();
                            });