YouTube Format IDs

A GitHub gist documents YouTube format IDs (itag codes) used to specify video quality and codec options when downloading or accessing YouTube videos. The reference includes format codes for various resolutions ranging from 144p to 4320p, with support for different video codecs including H.264, VP9, and AV1, noting that available formats depend on video age and popularity. The gist is maintained by Martin Eesmaa and includes distinctions between standard and high framerate (HFR) videos.