399 Mp4 -

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

Supports up to 60fps (High Frame Rate/HFR), offering smoother playback for action-heavy content. 399 mp4

AV1 ( av01 ), which is a modern, royalty-free codec designed for better compression and quality compared to older formats. (In this example, 399 is the 1080p AV1

Format is a video-only stream used by YouTube for high-quality content. Key characteristics include: Resolution: 1080p (Full HD). (In this example

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