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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

目前为 2020-04-13 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     0.5.1
  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. parseTime("0:4.2");
  38.  
  39. function generateControl() {
  40.   let app = document.createElement("div");
  41.   let inputFrom = document.createElement("input");
  42.   inputFrom.placeholder = "from time";
  43.   let inputTo = document.createElement("input");
  44.   inputTo.placeholder = "to time";
  45.   let currentTime = document.createElement("span");
  46.   let btn = document.createElement("button");
  47.   let btnStop = document.createElement("button");
  48.   let btnExport = document.createElement("button");
  49.   applyStyle(app, {
  50.     display: "flex",
  51.     alignItems: "center",
  52.     justifyContent: "space-between",
  53.     maxWidth: "700px",
  54.     marginTop: "15px",
  55.     marginLeft: "auto",
  56.     marginRight: "auto",
  57.   });
  58.   applyStyle(currentTime, {
  59.     fontSize: "1.3rem",
  60.   });
  61.   let inputCommonStyle = {
  62.     width: "120px",
  63.   };
  64.   applyStyle(inputFrom, inputCommonStyle);
  65.   applyStyle(inputTo, inputCommonStyle);
  66.   btn.innerText = "Repeat play";
  67.   btnStop.innerText = "Stop";
  68.   btnExport.innerText = "Export";
  69.   app.appendChild(inputFrom);
  70.   app.appendChild(inputTo);
  71.   app.appendChild(currentTime);
  72.   app.appendChild(btn);
  73.   app.appendChild(btnStop);
  74.   app.appendChild(btnExport);
  75.   return {
  76.     app,
  77.     inputFrom,
  78.     inputTo,
  79.     currentTime,
  80.     btn,
  81.     btnStop,
  82.     btnExport,
  83.   };
  84. }
  85.  
  86. async function sleep(time) {
  87.   await new Promise((resolve) => {
  88.     setTimeout(() => {
  89.       resolve();
  90.     }, time);
  91.   });
  92. }
  93.  
  94. async function main() {
  95.   // Player fetching
  96.   console.log("Waiting for the player...");
  97.   let player;
  98.   while (true) {
  99.     player = document.querySelector("ytd-app #player");
  100.     if (player && !player.hidden) break;
  101.     await sleep(500);
  102.   }
  103.   let videoElement = document.querySelector("video");
  104.   if (!videoElement || !player) {
  105.     console.warn("Player not found. Exiting.");
  106.     return;
  107.   }
  108.   console.log("Player detected.");
  109.  
  110.   // Layout
  111.   let control = generateControl();
  112.   console.log(player);
  113.   player.appendChild(control.app);
  114.  
  115.   // States
  116.   let fromValue = 0,
  117.     toValue = 0;
  118.  
  119.   // Initial state update attempt
  120.   let urlTime = window.location.hash.match(
  121.     /#pvp([0-9]+\.?[0-9]?)-([0-9]+\.?[0-9]?)/
  122.   );
  123.   if (urlTime !== null) {
  124.     console.log("Attempting to recover time from URL...");
  125.     control.inputFrom.value = fromValue = Number(urlTime[1]) || 0;
  126.     control.inputTo.value = toValue = Number(urlTime[2]) || 0;
  127.   }
  128.  
  129.   // Current playback time
  130.   function updateCurrentTime() {
  131.     control.currentTime.innerText = Number(videoElement.currentTime).toFixed(2);
  132.     requestAnimationFrame(updateCurrentTime);
  133.   }
  134.   requestAnimationFrame(updateCurrentTime);
  135.  
  136.   // Repeat playback
  137.   function onTimeUpdate() {
  138.     if (videoElement.currentTime >= Number(toValue)) {
  139.       videoElement.currentTime = Number(fromValue);
  140.     }
  141.   }
  142.   control.btn.addEventListener("click", (evt) => {
  143.     evt.preventDefault();
  144.     videoElement.pause();
  145.     videoElement.currentTime = fromValue;
  146.     if (fromValue < toValue) {
  147.       videoElement.play();
  148.       videoElement.addEventListener("timeupdate", onTimeUpdate);
  149.     } else {
  150.       videoElement.removeEventListener("timeupdate", onTimeUpdate);
  151.     }
  152.   });
  153.   control.btnStop.addEventListener("click", (evt) => {
  154.     evt.preventDefault();
  155.     videoElement.removeEventListener("timeupdate", onTimeUpdate);
  156.     videoElement.pause();
  157.   });
  158.  
  159.   // Start/end time setting
  160.   function updateURL() {
  161.     history.pushState(null, null, `#pvp${fromValue}-${toValue}`);
  162.   }
  163.   control.inputFrom.addEventListener("change", () => {
  164.     let input = control.inputFrom.value;
  165.     if (input === "") {
  166.       fromValue = 0;
  167.       control.inputFrom.placeholder = "from 0";
  168.       return;
  169.     }
  170.     let time = parseTime(input);
  171.     if (time == -1) {
  172.       control.btn.disabled = true;
  173.       return;
  174.     }
  175.     control.btn.disabled = false;
  176.     fromValue = time;
  177.     updateURL();
  178.   });
  179.   control.inputTo.addEventListener("change", () => {
  180.     let input = control.inputTo.value;
  181.     if (input === "") {
  182.       toValue = videoElement.duration || 0;
  183.       control.inputTo.placeholder = `to ${toValue.toFixed(2)}`;
  184.       return;
  185.     }
  186.     let time = parseTime(input);
  187.     if (time == -1) {
  188.       control.btn.disabled = true;
  189.       return;
  190.     }
  191.     control.btn.disabled = false;
  192.     toValue = time;
  193.     updateURL();
  194.   });
  195.  
  196.   // Button export
  197.   control.btnExport.addEventListener("click", (evt) => {
  198.     evt.preventDefault();
  199.     let videoId = getVideoId(window.location);
  200.     alert(`ffmpeg -i $(youtube-dl -f bestaudio -g "https://www.youtube.com/watch?v=${videoId}") \
  201. -ss ${fromValue} \
  202. -to ${toValue} \
  203. -acodec libmp3lame \
  204. -ab 192k \
  205. -af loudnorm=I=-16:TP=-2:LRA=11 \
  206. output-${videoId}-${fromValue}-${toValue}.mp3`);
  207.   });
  208. }
  209.  
  210. main();