VP9 encoding often provides better quality at a lower bitrate (smaller file size) compared to older H.264 formats.
If you download only Format 609, your player might show a black screen or play without sound. Always remember to use the + syntax to add an audio ID. 609 mp4
To get a functional video file, you must merge Format 609 with an audio stream (like Format 140, which is standard M4A audio). Using the command line tool yt-dlp , you would use the following command: yt-dlp -f 609+140 [VIDEO_URL] VP9 encoding often provides better quality at a
Because it is a DASH (Dynamic Adaptive Streaming over HTTP) stream, it contains no audio. If you download it by itself, you will have a silent video. How to Download 609 with Audio To get a functional video file, you must
Understanding Format 609: How to Download 720p MP4s with yt-dlp
Format ID 609 is a YouTube-specific stream identifier. Its technical specs usually look like this: 1280x720 (720p) Container: MP4 Codec: vp09 (VP9) Type: Video-only
Older hardware or software (like older versions of QuickTime) may struggle to play VP9 video, even inside an MP4 container.