For detailed Windows and Linux instructions see this video:
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Websites used:
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NOTE: Lines that start with // are comments and NOT commands. Don't paste these in!

// First Create a waifu2X directory on the desktop

// Change System Settings, Privacy & Security, Full Disk Access and add the terminal program

// Now open the terminal and change Terminal directory to Desktop/waifu2x

// Turn off command security
sudo spctl --master-disable

// Create the needed subdirectories
mkdir video
mkdir frames
mkdir scaled

// Copy your MP4 video into waifu2x/video directory and rename it video.mp4

/ Get info about video: i.e. frame rate and dimensions
./ffprobe video/video.mp4

// Extract images to our frames folder
./ffmpeg -i video/video.mp4 frames/frame%06d.png

// Extract audio to our video folder
./ffmpeg -i video/video.mp4 video/audio.mp3

// Scale images: -s valid options are 1 2 4 8 16 or 32
./waifu2x-ncnn-vulkan -i frames/ -o scaled/ -n 2 -s 2

// Put video back together lower -crf means better quality but larger file sizes
// MAKE SURE YOU CHANGE THE FRAME RATES FROM 24 TO THE ACTUAL VIDEO
FRAME RATE!
./ffmpeg -f image2 -framerate 24 -i scaled/frame%06d.png -i video/audio.mp3 -r
24 -vcodec libx264 -crf 16 video/upscaled.mp4

// Turn security back on
sudo spctl --master-enable

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