RECOLA_frames.sh

#!/bin/bash

# Extract frames from the videos of the RECOLA data set. The images are then cropped to squares and resized to 50%.
# The script requires ffmpef and imagemagick installed.

for file in train_*.mp4
do
    echo $file
    DIR="frames_${file%.*}"
    mkdir $DIR
    ffmpeg -i $file -frames 300 "$DIR/frame_%d.png"
    for image in $DIR/*.png
    do
        echo $image
        convert $image -crop 720x720+280+0 $image # Crop image to a square
        convert $image -resize 50% $image # Resize image
    done
done