best export parameters to get the best quality outta YT

HI.
I just understood how YT decompress and re-encode all uploaded videos and that it's the reason everything I sent was messed up to oblivion.
I can use either kdenlive or shotcut, in both case i can provide parameters directly to ffmpeg as far as I understood, so can someone tell what are the best options ?

I tested it out:
551M essai_raw.mkv are is the raw footage file ( Format: V_MJPEG Codec ID: V_MJPEG)
I uploaded it to youtube, and it got converted into;
13M essai_vp9_youtube.webm

153M essai_export_kdenlive_vp9_maximum.webm is the file resulting from maximum quality VP9 encoding on Shotcut version 21.10.31
2,0M essai_export_kdenlive_vp9_minimum.webm is the minimum quality setting.
64M essai_export_kdenlive_vp9_standard.webm comes from the meidum/standard setting.

So why is YT using such terrible settings for a "high quality" codec ? Makes no sense.
Can I force an AV1 codec ? Would it even be different ?

Thanks.
 
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