GoKawiilCommunity-maintained gist catalogs YouTube's video/audio format itags
A publicly shared reference document lists nearly all known YouTube format IDs (itags) covering DASH video and audio streams across codecs like AV1, VP9, and H.264. Originally created by AgentOak in 2019, the gist has been maintained and expanded by Martin Eesmaa since 2022, with updates as recent as August 2026.