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To download the highest quality video in an MP4 container using yt-dlp , you need to account for how platforms like YouTube separate high-resolution video from high-quality audio. The Best "All-in-One" Command : Specifically looks for the best MP4 video
: As a final fallback, it grabs the absolute best quality (even if it's WebM/VP9) and merges it into an MP4. yt-dlp download highest quality mp4