399 Mp4 (Web)

It provides better visual quality at a lower bitrate than the older H.264 (AVC) codec.

If you want to manually select this format to ensure you get the AV1 1080p version, you would use a command similar to this in your terminal: yt-dlp -f 399+140 [VIDEO_URL] Use code with caution. Copied to clipboard 399 mp4

AV1 ( av01 ), which is a modern, royalty-free codec designed for better compression and quality compared to older formats. It provides better visual quality at a lower

(In this example, 399 is the 1080p AV1 video and 140 is the standard M4A audio stream.) Why Choose 399? which is a modern