So, your hard disk crashed?

You rescued it with ddrescue/other tools?

Now you don’t know if the files are still intact?

Here some solutions for some media file formats:

• Movies (avi, mpeg, mp3, mkv, webm, … everything ffmpeg can decode.)
  • ffmpeg -v error -i "$1" -f null - 2>"$1".log
  • decodes a movie or audio file and reports all errors into a logfile, so if you do that for every of your files you get a bunch of logfiles which you can grep for Read errors, then you have an idea which movies are damaged.

  • #!/bin/bash                                 
    
    if [ ! -e "$1.log" ]; then                  
            echo "Checking file: $1"            
            ffmpeg -v error -i "$1" -f null - 2>"$1".log                                    
            ls -l "$1".log                      
    else                                        
            echo "$1 already checked."          
    fi

    find . -type f -size +1M -exec ./check.sh "{}" \;

• Pictures (png, jpg/jpeg)
  • Use pngcheck for pngs
  • Use jpeginfo -c for jpgs
• Music (flac)
  • Just use flac -t to test a flac file

When I find some other useful integrity check methods for other file types or media I may add some.