// HACKER NEWS — CYBERSECURITY
YouTube Format IDs
Note: This is all almost full YouTube ID informations. Original owner goes to AgentOak, modified version by Martin Eesmaa.
Before this gist has been forked, AgentOak made original gist on November 13 2019 and it was last updated on May 5 2021.
From now on, this forked gist is maintained by Martin Eesmaa since 17 September 2022. I joined to yt-dlp Discord server on 3rd April 2026 with my Discord username: martineesmaa.
Also known as itag or format codes and way back they could be specified with the fmt parameter (e.g. &fmt=22) used to be on website address bar after YouTube Video ID, (deprecated?).
Depending on the age and/or popularity of the video, not all formats will be available.
Some rarely videos may get AV1 video codec for low views or/and upload date less than 24 hours for average 10 minutes duration video.
It could be luck or/and conveniency for YouTube's quiet decision.
https://www.youtube.com/watch?v=BizgNeskJ6o (20 hours ago and at least 50 views, reported on 26.06.2025, later it was deleted it)
https://www.youtube.com/watch?v=r-X4DJxT6gY (4 years ago and unlisted video, got couple months to get AV1)
Those duplicate video IDs of m3u8 as Apple Native HLS are linked to common numbers, not a rare numbers.
270 (m3u8) == 137 (https) are same video quality, but different protocol.