Created
January 3, 2019 17:27
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Get a direct MP4 link for a YouTube video
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| /* Notes | |
| Usage: Open YouTube in browser and run from console | |
| References: | |
| https://tyrrrz.me/Blog/Reverse-engineering-YouTube | |
| https://gist.github.com/el3zahaby/9e60f1ae3168c38cc0f0054c15cd6a83 | |
| http://rg3.github.io/youtube-dl/ https://github.com/rg3/youtube-dl/ | |
| const videoInfoRegex = /(?:quality=(\w*?),)(?:type=video\/mp4.*?)&url=(.*?),/g; // find all mp4 links | |
| */ | |
| async function extractYoutubeMp4Link(vidId) { | |
| const regex = /type=video\/mp4.*?&url=(.*?),/; // find first mp4 link | |
| const findStr = 'url_encoded_fmt_stream_map='; | |
| const findStrLen = 27 | |
| const vidInfo = await getVideoInfo(vidId); | |
| const decodedInfo = decodeURIComponent(decodeURIComponent(vidInfo)); | |
| const streamMap = decodedInfo.substr(decodedInfo.indexOf(findStr) + findStrLen); | |
| return regex.exec(streamMap)[1]; | |
| } | |
| function getVideoInfo(vidId) { | |
| const url = `https://www.youtube.com/get_video_info?video_id=${vidId}`; | |
| return fetch(url, { | |
| mode: "no-cors", | |
| }) | |
| .then(res => res.text()) | |
| .then(body => body); | |
| } | |
| function getYoutubeMp4Link(vidId) { | |
| extractYoutubeMp4Link(vidId) | |
| .then(url => console.log(url)) | |
| .catch(err => console.error(err)); | |
| } |
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