mov2frames.sh

# Incorporate this function into your .bash_profile (.bashrc, .zshrc, or whatever you use...)
# Run `mov2frames name-of-mov.mov` to extract frames from the movie file
# Run `mov2frames name-of-mov.mov 300` to extract frames from the movie file at a maximum width of 300 pixels
# Frames will be exported into a `frames/` folder
# NOTE: if the frames folder exists and contains files that match the filename `frame_%03d.png`, no frames will be generated
mov2frames() {
    if [ ! -z "$2" ]
    then
      size=$2
    else
      size=-1
    fi

    tmp_dir="./frames"
    mkdir $tmp_dir

    echo "\033[33m Extract frames $1 ($2px wide)"
    echo "\033[32m ## Extracting frames..."

    # Assumes video with 30 fps
    ffmpeg -i $1 -vf scale=$size:-1 -r 30 $tmp_dir/frame_%03d.png
}