Create crappy video using ffmpeg for training the net

create_grainy_film.sh

# download grain video
rm -Rf build
YT_GRAIN_OVERLAY="https://www.youtube.com/watch?v=J_MZb7qTenE"
mkdir -p build
youtube-dl "$YT_GRAIN_OVERLAY" -f mp4 --output "build/grain.mp4"
# invert colors
ffmpeg -loglevel quiet -y -i "build/grain.mp4" -vf negate 'color_inverted.mp4'
# overlay video
ffmpeg \
    -y \
    -loglevel quiet \
    -i "seinfeld.mp4" \
    -i "color_inverted.mp4" \
    -filter_complex "[1:v][0:v]blend=all_mode='softlight':all_opacity=1" \
    "output_test.mp4"