How to download a single frame from a YouTube video with highest quality

How to download a single frame from a YouTube video, at specific timestamp, from highest video quality source:

ffmpeg -ss 3:01.5 -i $(youtube-dl -f bestvideo/best --get-url "https://www.youtube.com/watch?v=SL3FlgWQiS4") -vframes 1 -q:v 2 ytscreenshot.png

ffmpeg -ss 3:01.5 -i $(youtube-dl -f bestvideo/best --get-url "https://www.youtube.com/watch?v=SL3FlgWQiS4") -vframes 1 -q:v 2 ytscreenshot.png

Links

• FFmpeg: What is an acceptable value for the q= parameter?
• How To Select Video Quality In Youtube-Dl?
• Is it possible to only download a single frame from a youtube video?