// ==UserScript==
// @name Facebook Videos Detector (Generates ffmpeg download command)
// @namespace http://tampermonkey.net/
// @version 1.1
// @description This script will help you to list all facebook videos that were loaded during your session
// @author Mahmoud Khudairi
// @match https://www.facebook.com/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=facebook.com
// @grant none
// ==/UserScript==
(function () {
"use strict";
const loaderFunction = function () {
const videos = document.getElementById("videos");
const domParser = new DOMParser();
const contents = JSON.parse(
document.getElementById("contents").textContent
);
const dashURL = new URL(
"https://www.facebook.com/video/playback/dash_mpd_debug.mpd"
);
function getContent(videoId, userInserted = false) {
const videoEl = document.createElement("div");
videoEl.className = "video";
videos.append(videoEl);
(async function () {
dashURL.searchParams.set("v", videoId);
const mpdData = await fetch(dashURL.toString()).then((res) =>
res.text()
);
const mpdDom = domParser.parseFromString(mpdData, "text/xml");
const sources = Array.from(
mpdDom.documentElement
.querySelector('AdaptationSet[contentType="video"], AdaptationSet:has(Representation[mimeType^="video"])')
?.querySelectorAll("Representation") || []
).map((r) => ({
id: r.getAttribute("id"),
width: +r.getAttribute("width"),
height: +r.getAttribute("height"),
bitrate: +r.getAttribute("bandwidth"),
frameRate: r.parentElement
.getAttribute("frameRate")
.split("/")
.reduce((a, c) => a / c),
url: r.textContent,
initRange: r.querySelector("Initialization").getAttribute("range"),
indexRange: r.querySelector("SegmentBase").getAttribute("indexRange"),
firstSegmentRange: r
.querySelector("SegmentBase")
.getAttribute("FBFirstSegmentRange"),
mimeType: r.getAttribute("mimeType"),
}));
const minSource = sources[0];
if (!minSource) {
videoEl.remove();
if (userInserted) alert(`Your requested video: ${videoId} was not found`);
return;
}
const maxSource = sources.at(-1);
const segmentUrl = new URL(minSource.url);
segmentUrl.searchParams.set("bytestart", "0");
segmentUrl.searchParams.set(
"byteend",
minSource.firstSegmentRange.split("-")[1]
);
const video = document.createElement("video");
video.src = segmentUrl.toString();
await new Promise((rs) =>
video.addEventListener("canplay", rs, { once: 1 })
);
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
canvas.width = minSource.width;
canvas.height = minSource.height;
canvas.style.aspectRatio = `${minSource.width}/${minSource.height}`;
const bufStart = video.buffered.start(0);
const bufEnd = video.buffered.end(0);
const bufDuration = bufEnd - bufStart;
const randomPosition = bufStart + Math.random() * bufDuration;
video.currentTime = randomPosition;
await new Promise((rs) =>
video.addEventListener("seeked", rs, { once: 1 })
);
ctx.drawImage(
video,
0,
0,
canvas.width,
canvas.height,
0,
0,
canvas.width,
canvas.height
);
videoEl.append(canvas);
const maxAudio = Array.from(
mpdDom.documentElement
.querySelector('AdaptationSet[contentType="audio"], AdaptationSet:has(Representation[mimeType^="audio"])')
?.querySelectorAll("Representation") || []
)
.map((r) => ({
url: r.textContent,
bitrate: +r.getAttribute("bandwidth"),
}))
.at(-1);
const downloadCommand = ["ffmpeg"];
downloadCommand.push("-i", `"${maxSource.url}"`);
if (maxAudio) downloadCommand.push("-i", `"${maxAudio.url}"`);
downloadCommand.push("-c:v", "h264", "-b:v", maxSource.bitrate);
if (maxAudio)
downloadCommand.push("-c:a", "aac", "-b:a", maxAudio.bitrate);
downloadCommand.push(`${videoId}.mp4`);
const downloadCommandText = downloadCommand.join(" ");
videoEl.addEventListener("click", function () {
navigator.clipboard
.writeText(downloadCommandText)
.then(() => alert("Commad copied!"))
.catch(() => {
console.log(downloadCommandText);
alert(
"Could not copy command, but it was printed in browser's console"
);
});
});
})();
}
for (const content of contents) getContent(content)
const addbtn = document.getElementById('addbtn');
addbtn.addEventListener("click", () => {
const id = prompt('FB Video ID:');
if (id) getContent(id, true);
});
};
const xml = new window.XMLSerializer();
const dom = window.document.implementation.createDocument(
"http://www.w3.org/1999/xhtml",
"html",
null
);
const head = dom.createElement("head");
const body = dom.createElement("body");
const style = dom.createElement("style");
style.innerHTML = `* {box-sizing: border-box;}
body {
font-family: Segoe UI;
margin: 0 20px;
}
#videos {
display: grid;
grid-template-columns: repeat(auto-fit, 320px);
gap: 10px;
margin-bottom: 20px;
}
#videos .video {
background-color: black;
height: 180px;
cursor: pointer
}
#videos .video canvas {
width: 100%;
height: 100%;
object-fit: contain;
}`;
head.append(style);
const contents = document.createElement("script");
contents.id = "contents";
contents.type = "application/json";
contents.textContent = "[]";
head.append(contents);
const script = document.createElement("script");
script.src = URL.createObjectURL(
new Blob(
[`window.addEventListener("load", ${loaderFunction.toString()});`],
{ type: "application/javascript" }
)
);
head.append(script);
body.innerHTML =
'<h1>Facebook Videos Detector</h1><p>Videos found on your facebook session:</p><div id="videos"></div><button id="addbtn">Add new video</button>';
dom.firstChild.append(head, body);
const cache = new Set();
window.addEventListener("keyup", function (e) {
viewing: if ((e.altKey || (e.ctrlKey && e.shiftKey)) && e.code === "KeyV") {
e.preventDefault();
// if (!cache.size) {
// this.alert("There is no videos found");
// break viewing;
// }
contents.textContent = JSON.stringify(Array.from(cache));
dom.title = `Facebook Videos Detector - (${cache.size} video${
cache.size > 1 ? "s" : ""
} ${cache.size > 1 ? "were" : "was"} found)`;
this.open(
URL.createObjectURL(
new Blob([xml.serializeToString(dom)], { type: dom.contentType })
),
"_blank"
);
}
});
window.fetch = new Proxy(window.fetch, {
async apply(target, arg, args) {
const url = new URL(args[0]);
caching: if (
/\.mp4$/.test(url.pathname.split("/").at(-1)) &&
url.searchParams.has("efg")
) {
const efg = JSON.parse(window.atob(url.searchParams.get("efg")));
const id = efg.video_id;
if (cache.has(id)) break caching;
cache.add(id);
}
return target.apply(arg, args);
},
});
})();
