Ffmpeg-based bash script to dump & recode all relevant portions of DVD-video ISO's in a directory

ffmpeg_dump-a-video-dvd.sh

#!/bin/bash
# ffmpeg_dump-a-video-dvd.sh

# === INFO ===
# This is just a simple processing script that does the following:
#
# 1) Takes in all the ISO files in the directory; intended for video-DVD's.
# 2) Extracts the contents (according to the minimum duration; change the variable below).
# 3) Re-encodes the contents with HEVC/H.265, deinterlaces the video, and creates an output directory for each disc.
#
# The script is provided AS-IS, and is to be used AT YOUR OWN RISK.
# Use only for allowed backups of legitimate copies!
# FlyingFathead 2024 // https://github.com/FlyingFathead
# thanks as usual to ChaosWhisperer for digital ghost code

# === prerequisites ===
# (on Debian/Ubuntu tree Linux distros)
# $ sudo apt-get install p7zip-full
# $ sudo apt-get install ffmpeg
# $ sudo apt-get install bc
# $ sudo apt-get install libdvd-pkg

# === options ===
# Set the minimum duration in seconds (e.g., 20 minutes = 1200 seconds)
# This avoids extracting unneeded extras like title screens and such.
MIN_DURATION=1200

# Set the video and audio encoding options
VIDEO_CODEC="hevc_nvenc"    # Video codec (e.g., hevc_nvenc for NVIDIA GPU encoding)
VIDEO_PRESET="slow"         # Encoding speed/quality tradeoff (slower = better quality)
VIDEO_CQ=26                 # Constant Quality (CQ) level (lower = better quality, larger file)
AUDIO_CODEC="aac"           # Audio codec (e.g., aac)
AUDIO_BITRATE="128k"        # Audio bitrate (e.g., 128k)

# Log file
LOG_FILE="iso_processing.log"
echo "Log started at $(date)" > "$LOG_FILE"

# Ensure the script is run from the directory with the ISO files
echo "Starting the ISO processing script in directory: $(pwd)" | tee -a "$LOG_FILE"

# Loop over each ISO file in the current directory
for iso in *.iso; do
    output_dir="$(basename "$iso" .iso)_output"
    
    echo "Processing ISO: $iso" | tee -a "$LOG_FILE"
    
    mkdir -p "$output_dir" || { echo "Failed to create output directory $output_dir" | tee -a "$LOG_FILE"; continue; }

    # Extract the ISO using 7z
    echo "Extracting $iso to $output_dir" | tee -a "$LOG_FILE"
    7z x "$iso" -o"$output_dir" 2>&1 | tee -a "$LOG_FILE"
    
    if [ $? -ne 0 ]; then
        echo "Failed to extract $iso" | tee -a "$LOG_FILE"
        continue
    fi

    # Process each .VOB file in the extracted VIDEO_TS directory
    for vob_file in "$output_dir/VIDEO_TS/"*.VOB; do
        if [ -f "$vob_file" ]; then
            duration=$(ffmpeg -i "$vob_file" 2>&1 | grep "Duration" | awk '{print $2}' | tr -d ',' | awk -F: '{ print ($1 * 3600) + ($2 * 60) + $3 }')
            
            if (( $(echo "$duration >= $MIN_DURATION" | bc -l) )); then
                base_name=$(basename "$vob_file" .VOB)
                output_file="$output_dir/${base_name}_h265_nvenc.mp4"
                echo "Re-encoding $vob_file to $output_file with deinterlacing" | tee -a "$LOG_FILE"
                ffmpeg -i "$vob_file" \
                    -vf yadif \
                    -c:v $VIDEO_CODEC \
                    -preset $VIDEO_PRESET \
                    -cq $VIDEO_CQ \
                    -c:a $AUDIO_CODEC \
                    -b:a $AUDIO_BITRATE \
                    "$output_file" 2>&1 | tee -a "$LOG_FILE"
                
                if [ $? -ne 0 ]; then
                    echo "Failed to re-encode $vob_file" | tee -a "$LOG_FILE"
                else
                    echo "Successfully re-encoded $vob_file to $output_file" | tee -a "$LOG_FILE"
                fi
            else
                echo "Skipping $vob_file (duration: $duration seconds)" | tee -a "$LOG_FILE"
            fi
        else
            echo "No .VOB files found in $output_dir/VIDEO_TS/" | tee -a "$LOG_FILE"
        fi
    done

    # Remove the VIDEO_TS and AUDIO_TS directories as they are no longer needed
    echo "Removing VIDEO_TS and AUDIO_TS directories from $output_dir" | tee -a "$LOG_FILE"
    rm -rf "$output_dir/VIDEO_TS" "$output_dir/AUDIO_TS"

    echo "Finished processing $iso" | tee -a "$LOG_FILE"
done

echo "All ISOs have been processed." | tee -a "$LOG_FILE"