Parallel video corruption check for a whole folder with csv output

video_check.sh

#!/bin/bash

folder="$1"
parallelism="$2" # No parallelism, i.e. set to 1, works best so far
results_file="${folder}/results.csv"

# Function to check if a video file is corrupt using ffmpeg
check_video_corruption() {
  renice -n 19 $$ > /dev/null 2>&1
  ionice -c 3 -p $$ > /dev/null 2>&1
  file="$1"
  output=$(ffmpeg -v error -i "$file" -f null - 2>&1)
  if [[ $output == "" ]]; then
    echo "\"${file}\",OK"
  else
    echo "\"${file}\",BROKEN"
  fi
}

# Exporting the function to be used by parallel command
export -f check_video_corruption

# Loop over video files in the folder and check for corruption in parallel
find "$folder" -type f -name "*.mp4" -o -name "*.mkv" -o -name "*.avi" | parallel -t -j "$parallelism" check_video_corruption {} >>"$results_file"

echo "Video corruption check completed. Results written to $results_file."