It provides better visual quality at a lower bitrate than the older H.264 (AVC) codec.
(In this example, 399 is the 1080p AV1 video and 140 is the standard M4A audio stream.) Why Choose 399? 399 mp4
It is the most modern codec YouTube offers for 1080p, allowing for higher frame rates that older caps (like 30fps) don't support. It provides better visual quality at a lower
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