Mp4 | 609

You must have FFmpeg installed and in your system's PATH for the merging process to work automatically. Why Choose 609? Users often look for Format 609 because:

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] 609 mp4

Older hardware or software (like older versions of QuickTime) may struggle to play VP9 video, even inside an MP4 container. You must have FFmpeg installed and in your