How to use Golang download YouTube video

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How to use Golang download YouTube video LINE Developer Relations Evan Lin 2020.05 1

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Evan Lin • Google Developer Expert • LINE Developer Meetup • LINE TAIWAN TECHPULSE Organizer LINE Technology Evangelist 2

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How to get Youtube Video Info? https://www.youtube.com/watch?v=rFejpH_tAHM https://youtube.com/get_video_info?video_id=rFejpH_tAHM 4

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How to get Youtube Video Info? 5

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RAW Data 6

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How to parse with Query Parameter 7

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Get Video Author and Title How to handle JSON value without structure data. 8

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Let’s find the video download link 9

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How to process JSON data from Web Jsonlint.com à Paste and copy on text editor à Json to Go 10

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Using the file download link… 11

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Using the file download link… (what?) No url??? But new ”cipher”? 12

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Finally … https://stackoverflow.com /questions/60607291/you tube-video-downloader- with-php 13

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Look into browser player related setting https://www.youtube.com/embed/FHpvI8oGsuQ?hl=en https://www.youtube.com/s/player/e3cd195e/player_ias.vflset/en_US/base.js 14

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Make it simple … “string” EQ(“string”, 3) è c = ‘s’ è a[0] = a[2] = `r` è a[2] = `s` à “rtsing” 15

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Decipher :Operation 16

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Decipher : Parse Ops and Args https://github.com/kkdai/youtube/blob/master/decipher.go#L12 17

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Looking for contributors 18 https://github.com/kkdai/youtube

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LINE TECH FRESH https://engineering.linecorp.com/zh-hant/blog/tech-fresh-2020/ 19