☰

精确控制视频播放进度 (YouTube)

精确控制视频播放进度/生成剪辑脚本的工具栏

当前为 2020-05-13 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name        Precise video playback (YouTube)
  3. // @name:zh-CN  精确控制视频播放进度 (YouTube)
  4. // @description A toolbar to set precise video play time and generate clip script
  5. // @description:zh-CN 精确控制视频播放进度/生成剪辑脚本的工具栏
  6. // @namespace   moe.suisei.pvp.youtube
  7. // @match       https://www.youtube.com/watch*
  8. // @grant       none
  9. // @version     0.5.3
  10. // @author      Outvi V
  11. // ==/UserScript==
  12.  
  13. "use strict";
  14.  
  15. console.log("Precise Video Playback is up");
  16.  
  17. function getVideoId(url) {
  18.   return String(url).match(/v=([^&#]+)/)[1];
  19. }
  20.  
  21. function applyStyle(elem, styles) {
  22.   for (const [key, value] of Object.entries(styles)) {
  23.     elem.style[key] = value;
  24.   }
  25. }
  26.  
  27. function parseTime(str) {
  28.   if (!isNaN(Number(str))) return Number(str);
  29.   let time = str.match(/([0-9]?)?:([0-9]+)(\.([0-9]+))?/);
  30.   if (time === null) return -1;
  31.   let ret =
  32.     Number(time[1] || 0) * 60 + Number(time[2]) + Number(time[4] || 0) * 0.1;
  33.   if (ret == NaN) return -1;
  34.   return ret;
  35. }
  36.  
  37. function generateControl() {
  38.   let app = document.createElement("div");
  39.   let inputFrom = document.createElement("input");
  40.   inputFrom.placeholder = "from time";
  41.   let inputTo = document.createElement("input");
  42.   inputTo.placeholder = "to time";
  43.   let currentTime = document.createElement("span");
  44.   let btn = document.createElement("button");
  45.   let btnStop = document.createElement("button");
  46.   let btnExport = document.createElement("button");
  47.   applyStyle(app, {
  48.     display: "flex",
  49.     alignItems: "center",
  50.     justifyContent: "space-between",
  51.     maxWidth: "700px",
  52.     marginTop: "15px",
  53.     marginLeft: "auto",
  54.     marginRight: "auto",
  55.   });
  56.   applyStyle(currentTime, {
  57.     fontSize: "1.3rem",
  58.     color: "var(--yt-spec-text-primary)",
  59.   });
  60.   let inputCommonStyle = {
  61.     width: "120px",
  62.   };
  63.   applyStyle(inputFrom, inputCommonStyle);
  64.   applyStyle(inputTo, inputCommonStyle);
  65.   btn.innerText = "Repeat play";
  66.   btnStop.innerText = "Stop";
  67.   btnExport.innerText = "Export";
  68.   app.appendChild(inputFrom);
  69.   app.appendChild(inputTo);
  70.   app.appendChild(currentTime);
  71.   app.appendChild(btn);
  72.   app.appendChild(btnStop);
  73.   app.appendChild(btnExport);
  74.   return {
  75.     app,
  76.     inputFrom,
  77.     inputTo,
  78.     currentTime,
  79.     btn,
  80.     btnStop,
  81.     btnExport,
  82.   };
  83. }
  84.  
  85. async function sleep(time) {
  86.   await new Promise((resolve) => {
  87.     setTimeout(() => {
  88.       resolve();
  89.     }, time);
  90.   });
  91. }
  92.  
  93. async function main() {
  94.   // Player fetching
  95.   console.log("Waiting for the player...");
  96.   let player;
  97.   while (true) {
  98.     player = document.querySelector("ytd-app #player");
  99.     if (player && !player.hidden) break;
  100.     await sleep(500);
  101.   }
  102.   let videoElement = document.querySelector("video");
  103.   if (!videoElement || !player) {
  104.     console.warn("Player not found. Exiting.");
  105.     return;
  106.   }
  107.   console.log("Player detected.");
  108.  
  109.   // Layout
  110.   let control = generateControl();
  111.   console.log(player);
  112.   player.appendChild(control.app);
  113.  
  114.   // States
  115.   let fromValue = 0,
  116.     toValue = 0;
  117.  
  118.   // Initial state update attempt
  119.   let urlTime = window.location.hash.match(
  120.     /#pvp([0-9]+\.?[0-9]?)-([0-9]+\.?[0-9]?)/
  121.   );
  122.   if (urlTime !== null) {
  123.     console.log("Attempting to recover time from URL...");
  124.     control.inputFrom.value = fromValue = Number(urlTime[1]) || 0;
  125.     control.inputTo.value = toValue = Number(urlTime[2]) || 0;
  126.   }
  127.  
  128.   // Current playback time
  129.   function updateCurrentTime() {
  130.     control.currentTime.innerText = Number(videoElement.currentTime).toFixed(2);
  131.     requestAnimationFrame(updateCurrentTime);
  132.   }
  133.   requestAnimationFrame(updateCurrentTime);
  134.  
  135.   // Repeat playback
  136.   function onTimeUpdate() {
  137.     if (videoElement.currentTime >= Number(toValue)) {
  138.       videoElement.currentTime = Number(fromValue);
  139.     }
  140.   }
  141.   control.btn.addEventListener("click", (evt) => {
  142.     evt.preventDefault();
  143.     videoElement.pause();
  144.     videoElement.currentTime = fromValue;
  145.     if (fromValue < toValue) {
  146.       videoElement.play();
  147.       videoElement.addEventListener("timeupdate", onTimeUpdate);
  148.     } else {
  149.       videoElement.removeEventListener("timeupdate", onTimeUpdate);
  150.     }
  151.   });
  152.   control.btnStop.addEventListener("click", (evt) => {
  153.     evt.preventDefault();
  154.     videoElement.removeEventListener("timeupdate", onTimeUpdate);
  155.     videoElement.pause();
  156.   });
  157.  
  158.   // Start/end time setting
  159.   function updateURL() {
  160.     history.pushState(null, null, `#pvp${fromValue}-${toValue}`);
  161.   }
  162.   control.inputFrom.addEventListener("change", () => {
  163.     let input = control.inputFrom.value;
  164.     if (input === "") {
  165.       fromValue = 0;
  166.       control.inputFrom.placeholder = "from 0";
  167.       return;
  168.     }
  169.     let time = parseTime(input);
  170.     if (time == -1) {
  171.       control.btn.disabled = true;
  172.       return;
  173.     }
  174.     control.btn.disabled = false;
  175.     fromValue = time;
  176.     updateURL();
  177.   });
  178.   control.inputTo.addEventListener("change", () => {
  179.     let input = control.inputTo.value;
  180.     if (input === "") {
  181.       toValue = videoElement.duration || 0;
  182.       control.inputTo.placeholder = `to ${toValue.toFixed(2)}`;
  183.       return;
  184.     }
  185.     let time = parseTime(input);
  186.     if (time == -1) {
  187.       control.btn.disabled = true;
  188.       return;
  189.     }
  190.     control.btn.disabled = false;
  191.     toValue = time;
  192.     updateURL();
  193.   });
  194.  
  195.   // Button export
  196.   control.btnExport.addEventListener("click", (evt) => {
  197.     evt.preventDefault();
  198.     let videoId = getVideoId(window.location);
  199.     alert(`ffmpeg -i $(youtube-dl -f bestaudio -g "https://www.youtube.com/watch?v=${videoId}") \
  200. -ss ${fromValue} \
  201. -to ${toValue} \
  202. -acodec libmp3lame \
  203. -ab 192k \
  204. -af loudnorm=I=-16:TP=-2:LRA=11 \
  205. -vn \
  206. output-${videoId}-${fromValue}-${toValue}.mp3`);
  207.   });
  208. }
  209.  
  210. main();