[Solved] How to get the smallest possible video size without any support in mind?

Myzel394 Asks: How to get the smallest possible video size without any support in mind?
I would like to save videos from Youtube on my disk from a channel who is uploading multiple times a day.

My question​

How do I create the smallest possible size (preferably with ffmpeg) without any support in mind? I don’t need to be able to play the videos at any time. If I have to re-encode them watching, that’s fine.

My research​

I already looked up the best compression algorithms, and it seems that VP9 with 10bit color depth and a crf of 23 creates the smallest possible size?

Is this true or is there a better method available?

I also saw some people compressing 1gb of video to a 1mb zip (or 7z or so) file but I wasn’t able to do so as well – is this possible or is this fake?

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