399 Mp4 «5000+ TOP»

Usually wrapped in an MP4 container, though it is technically "video-only" and must be merged with an audio stream (like itag 140) to create a playable video file. How to use it in yt-dlp

AV1 ( av01 ), which is a modern, royalty-free codec designed for better compression and quality compared to older formats. 399 mp4

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 Usually wrapped in an MP4 container, though it

It is the most modern codec YouTube offers for 1080p, allowing for higher frame rates that older caps (like 30fps) don't support. Copied to clipboard It is the most modern

According to technical discussions on Reddit and GitHub , 399 is often preferred because:

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