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 lower bitrate (smaller file size) compared to older H.264 formats. 609 mp4
Older hardware or software (like older versions of QuickTime) may struggle to play VP9 video, even inside an MP4 container. To get a functional video file, you must
While VP9 is typically associated with WebM, Format 609 wraps it in an MP4 container, which can be useful for certain modern media players that prefer the MP4 extension but support the VP9 codec. Common Issues While VP9 is typically associated with WebM, Format
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
If you’ve ever run yt-dlp -F on a YouTube video, you might have noticed a specific entry labeled . While it looks like a standard video file, there are a few technical quirks you need to know to use it properly. What is Format 609?
