This is a collection of ffmpeg scripts that have been useful.

ffmpeg_avi_to_mkv.sh

#!/usr/bin/bash

set -euo pipefail

for video in *.avi; do
  ffmpeg -i "${video}" -c:v libx265 -crf 23 -c:a aac "${video%.avi}.mkv"
done

ffmpeg_fix_subtitle.sh

#!/usr/bin/bash

set -euo pipefail

for i in *.srt; do
  ffmpeg -v 8 -loglevel 99 -sub_charenc CP1252 -i "$i" "${i%.srt}_fix.srt"
done

ffmpeg_soft_add_ass_subtitles_to_mkv.sh

#!/bin/bash

set -euo pipefail

# Directory containing the files (change this if needed)
DIRECTORY="."

# Function to find the corresponding subtitle file for a given mkv
get_subtitle() {
  local mkv_file="$1"
  local subtitle_file

  # Extract the base name (e.g., Still Game S1EP1)
  local base_name=$(basename "$mkv_file" .mkv)

  # Construct the subtitle filename (e.g., Still Game S1EP1.srt)
  subtitle_file="${base_name}.ass"

  # Check if the subtitle file exists
  if [ -f "$DIRECTORY/$subtitle_file" ]; then
    echo "$DIRECTORY/$subtitle_file"
  else
    echo ""  # Return an empty string if no subtitle is found
  fi
}

# Loop through all mkv files in the directory
for mkv_file in "$DIRECTORY"/*.mkv; do

  echo "Processing mkv_file: $mkv_file"  # Debugging: Print the mkv filename

  # Get the corresponding subtitle file
  subtitle_file=$(get_subtitle "$mkv_file")

  echo "subtitle_file: $subtitle_file" # Debugging: Print the subtitle filename

  # Check if a subtitle file was found
  if [ -n "$subtitle_file" ]; then
    # Construct the output filename (e.g., Still Game S1EP1_eng.mkv)
    output_file="${mkv_file%.mkv}_eng.mkv"

    echo "output_file: $output_file" # Debugging: Print the output filename

    # Run the ffmpeg command
    echo "Processing: $mkv_file and $subtitle_file -> $output_file"
    # ffmpeg -i "$mkv_file" -i "$subtitle_file" -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=eng "$output_file"
    ffmpeg -i "$mkv_file" -i "$subtitle_file" -c:v copy -c:a copy -c:s ass -map 0:0 -map 1:0 -metadata:s:s:0 language=eng "$output_file"

    # Check for errors
    if [ $? -ne 0 ]; then
      echo "Error processing $mkv_file and $subtitle_file"
    fi
  else
    echo "No subtitle found for $mkv_file"
  fi
done

echo "Finished processing all files."

ffmpeg_soft_add_subtitles.sh

#!/bin/bash

set -euo pipefail

# Directory containing the files (change this if needed)
DIRECTORY="."

# Function to find the corresponding subtitle file for a given MP4
get_subtitle() {
  local mp4_file="$1"
  local subtitle_file

  # Extract the base name (e.g., Still Game S1EP1)
  local base_name=$(basename "$mp4_file" .mp4)

  # Construct the subtitle filename (e.g., Still Game S1EP1.srt)
  subtitle_file="${base_name}.srt"

  # Check if the subtitle file exists
  if [ -f "$DIRECTORY/$subtitle_file" ]; then
    echo "$DIRECTORY/$subtitle_file"
  else
    echo ""  # Return an empty string if no subtitle is found
  fi
}

# Loop through all MP4 files in the directory
for mp4_file in "$DIRECTORY"/*.mp4; do

  echo "Processing mp4_file: $mp4_file"  # Debugging: Print the MP4 filename

  # Get the corresponding subtitle file
  subtitle_file=$(get_subtitle "$mp4_file")

  echo "subtitle_file: $subtitle_file" # Debugging: Print the subtitle filename

  # Check if a subtitle file was found
  if [ -n "$subtitle_file" ]; then
    # Construct the output filename (e.g., Still Game S1EP1_eng.mp4)
    output_file="${mp4_file%.mp4}_eng.mp4"

    echo "output_file: $output_file" # Debugging: Print the output filename

    # Run the ffmpeg command
    echo "Processing: $mp4_file and $subtitle_file -> $output_file"
    ffmpeg -i "$mp4_file" -i "$subtitle_file" -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=eng "$output_file"

    # Check for errors
    if [ $? -ne 0 ]; then
      echo "Error processing $mp4_file and $subtitle_file"
    fi
  else
    echo "No subtitle found for $mp4_file"
  fi
done

echo "Finished processing all files."

ffmpeg_soft_add_subtitles_to_mkv.sh

#!/bin/bash

set -euo pipefail

# Directory containing the files (change this if needed)
DIRECTORY="."

# Function to find the corresponding subtitle file for a given mkv
get_subtitle() {
  local mkv_file="$1"
  local subtitle_file

  # Extract the base name (e.g., Still Game S1EP1)
  local base_name=$(basename "$mkv_file" .mkv)

  # Construct the subtitle filename (e.g., Still Game S1EP1.srt)
  subtitle_file="${base_name}.srt"

  # Check if the subtitle file exists
  if [ -f "$DIRECTORY/$subtitle_file" ]; then
    echo "$DIRECTORY/$subtitle_file"
  else
    echo ""  # Return an empty string if no subtitle is found
  fi
}

# Loop through all mkv files in the directory
for mkv_file in "$DIRECTORY"/*.mkv; do

  echo "Processing mkv_file: $mkv_file"  # Debugging: Print the mkv filename

  # Get the corresponding subtitle file
  subtitle_file=$(get_subtitle "$mkv_file")

  echo "subtitle_file: $subtitle_file" # Debugging: Print the subtitle filename

  # Check if a subtitle file was found
  if [ -n "$subtitle_file" ]; then
    # Construct the output filename (e.g., Still Game S1EP1_eng.mkv)
    output_file="${mkv_file%.mkv}_eng.mkv"

    echo "output_file: $output_file" # Debugging: Print the output filename

    # Run the ffmpeg command
    echo "Processing: $mkv_file and $subtitle_file -> $output_file"
    ffmpeg -i "$mkv_file" -i "$subtitle_file" -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=eng "$output_file"

    # Check for errors
    if [ $? -ne 0 ]; then
      echo "Error processing $mkv_file and $subtitle_file"
    fi
  else
    echo "No subtitle found for $mkv_file"
  fi
done

echo "Finished processing all files."