Cutting a video segment with fading in and out using ffmpeg:
<code>
ffmpeg -i tp.mp4 -ss 1:18 -to 3:20.5 -vf "fade=type=in:start_time=0:duration=3,fade=type=out:start_time=193:duration=3" output_tp.mp4
</code>


Creating a Spotify canvas video (720x1280) using ffmpeg:
<code>
ffmpeg -i "$1" -vf "scale=720:-1,pad=720:1280:(ow-iw)/2:(oh-ih)/2:black" -c:a copy "$2"
</code>