ffmpeg \
    -r 30000/1001 \
    -i 'frames/dither-%04d.png' \
    -i 'cats-audio.wav' \
    -ac 2 \
    -ar 48000 \
    -vf 'pad=w=640:h=360:x=52:y=20' \
    -pix_fmt yuv420p \
    -movflags +faststart \
    -y cats-dither.mp4