javascript:{function waitForElm(o){return new Promise(t=>{if(document.querySelector(o))return t(document.querySelector(o));const n=new MutationObserver(e=>{document.querySelector(o)&&(t(document.querySelector(o)),n.disconnect())});n.observe(document.body,{childList:!0,subtree:!0})})}function insertAfter(e,t){e.parentNode.insertBefore(t,e.nextSibling)}async function InitGain(){await waitForElm(".ytd-watch-metadata");var e,t,n=document.querySelector("video");try{var o=new AudioContext,a=o.createMediaElementSource(n),i=o.createGain();a.connect(i),i.connect(o.destination),gainState=0}catch{executionState=0}function u(e){return 5<e?5:e<1?1:e}document.getElementById("gainInput")||(n=document.querySelector("video"),e=document.querySelector(".ytd-watch-metadata"),(t=document.createElement("input")).id="gainInput",t.style="width:25%;height:18px;font-size:18px;border-radius: 15px;padding:0px 8px;",t.type="text",t.placeholder="Gain Volume",t.value="1",t.classList.add("yt-spec-button-shape-next--tonal","yt-spec-button-shape-next--mono"),t.onclick=function(){this.select()},t.onmousewheel=function(e){e.preventDefault(),e.deltaY<0?this.value++:this.value--,this.value=u(this.value),i.gain.value=t.value},t.onchange=function(){this.blur(),t.value=u(this.value),i.gain.value=t.value},e.insertBefore(t,e.children[0]))}InitGain();};