>>49318145The original in 1080p version was 7.94mb @1475kbps, so I figured that I'd half the both of those and end up with 4mb/750kbps. 750k ended up being slightly larger than 4mb so I took it down to 740k and it was just right. I resized it to 720 from 1080 to keep the quality high while reducing the bitrate. here are the final commands that I used after pulling the video using yt-dlp:
ffmpeg -y -threads 8 -i ./spider.webm -an -vcodec vp9 -vf scale=1280:720,setsar=1:1 -crf 20 -vb 740k -pass 1 ./spider_720.webm
ffmpeg -y -threads 8 -i ./spider.webm -an -vcodec vp9 -vf scale=1280:720,setsar=1:1 -crf 20 -vb 740k -pass 2 ./spider_720.webm