Itag 299 is a common format ID used by video downloaders like yt-dlp to identify a high-quality video stream. : 1920x1080 (1080p). Frame Rate : 60fps (frames per second). Container : MP4 (DASH). Video Codec : AVC1 (H.264).

(This command pulls the 299 video and the 140 audio to create a complete 1080p MP4 file.)

Since format 299 is , media downloaders must "mux" (combine) it with an audio stream to create a playable video file.