How to replicate the output of the FullScreen template from StreamLadder

How to replicate the output of the FullScreen template from StreamLadder

How to replicate the output of the FullScreen template from StreamLadder

StreamLadder is a nifty little tool for creating vertical versions of your Twitch clips for platforms like Tiktok and YouTube Shorts. However, I like tinkering with FFmpeg so I replicated the output with a simple command.

If we look at the Fullscreen template, all it's essentially doing is cropping the original clip down into a 9:16 ratio.

To do the same with FFmpeg we can just do the following:

#!/usr/bin/env sh

# the source video (in this case, a twitch clip)
input=$1

# where you want to save the processed version
output=$2

ffmpeg \
    -i "$input" \
    -vf "crop=w=in_h*9/16:h=in_h,scale=1080x1920" \
    -vcodec libx264 \
    -crf 23 \
    -preset veryfast \
    -c:a copy \
    -s 1080x1920 \
    "$output"

The main part of this command doing all the work is the video filter, denoted with -vf. We do w=in_h*9/16 to set the width of the video to the 9:16 ratio compared to what the height of the video is while we keep the height the same with h=in_h. We finally scale the video up to 1080x1920 with the scale filter.

If the video quality looks a bit pixelated from scaling up too much, anywhere you see 1080x1920 replace with a smaller equivalent like 720x1280