convert and merge files

convert.sh

#!/bin/bash

# ================================================	echo "1) Convert videos (default)"
#	
# Run directly from this gist:	
#	
#   bash <(curl -sL https://gist.githubusercontent.com/krasi-georgiev/5f891acb246a36d475f0c5c451e658e9/raw/convert.sh)	
#	
# ================================================

echo "1) Convert videos (default)"
echo "2) Merge converted videos"
read -p "Enter your choice (1 or 2): " action_choice
action_choice=${action_choice:-1}

if [[ "$action_choice" == "1" ]]; then
  echo "1) Low Quality 576p (Fast, Small File Size) [default]"
  echo "2) High Quality 1080p"
  echo "3) High Quality 1080p 60fps"
  read -p "Enter your choice (1, 2 or 3): " quality_choice
  quality_choice=${quality_choice:-1}
fi

convert_videos() {
  case $quality_choice in
    1)
      RESOLUTION="1024:576"
      FPS=30
      CRF=28
      PRESET="ultrafast"
      AUDIO_BITRATE="96k"
      ;;
    2)
      RESOLUTION="1920:1080"
      FPS=30
      CRF=20
      PRESET="slow"
      AUDIO_BITRATE="192k"
      ;;
    3)
      RESOLUTION="1920:1080"
      FPS=60
      CRF=20
      PRESET="slow"
      AUDIO_BITRATE="192k"
      ;;
    *)
      echo "Invalid selection!"
      exit 1
      ;;
  esac

  echo "🎬 Converting to ${RESOLUTION} with ${FPS}fps"
  mapfile -d '' files < <(find "$(pwd)" -maxdepth 1 -type f \( -iname '*.mp4' -o -iname '*.mov' \) -print0 | sort -z)

  converted_folder="converted_${RESOLUTION}_${FPS}fps"
  mkdir -p "$converted_folder"

  for f in "${files[@]}"; do
    output="$converted_folder/$(basename "${f%.*}").mp4"
    if [[ -f "$output" ]]; then
      echo "Skipping existing file: $output"
      continue
    fi

    echo "🎬 Converting: $f -> $output"
    ffmpeg -fflags +genpts -avoid_negative_ts make_zero -i "$f" \
      -vf "fps=$FPS,scale=$RESOLUTION:force_original_aspect_ratio=decrease,pad=$RESOLUTION:(ow-iw)/2:(oh-ih)/2,setsar=1:1,format=yuv420p" \
      -r "$FPS" -fps_mode cfr -vsync cfr -reset_timestamps 1 \
      -af "aresample=async=1000:first_pts=0" -ar 48000 -ac 2 -c:a aac -b:a "$AUDIO_BITRATE" \
      -c:v libx265 -preset "$PRESET" -crf "$CRF" -g 30 \
      -movflags +faststart "$output"
  done

  merge_videos "$converted_folder"
}

merge_videos() {
  folder="$(realpath "$1")"
  echo "🎬 Merging the following files in folder '$folder':"

  mapfile -d '' files < <(find "$folder" -maxdepth 1 -type f -iname '*.mp4' -print0 | sort -z)

  if [[ ${#files[@]} -eq 0 ]]; then
    echo "No files found to merge in $folder."
    exit 1
  fi

  for f in "${files[@]}"; do
    echo "  $f"
  done

  concat_list=$(mktemp)
  metadata_file=$(mktemp)
  echo ";FFMETADATA1" > "$metadata_file"

  start_time=0
  for f in "${files[@]}"; do
    abs_path=$(realpath "$f")
    echo "file '$abs_path'" >> "$concat_list"

    duration=$(ffprobe -v error -select_streams v:0 -show_entries format=duration \
      -of default=noprint_wrappers=1:nokey=1 "$abs_path" | awk '{printf "%d", $1 * 1000}')

    end_time=$((start_time + duration))
    filename=$(basename "$f")

    echo -e "\n[CHAPTER]
TIMEBASE=1/1000
START=$start_time
END=$end_time
title=$filename" >> "$metadata_file"

    start_time=$end_time
  done

  output_path="$folder/merged_$(basename "$folder").mp4"
  ffmpeg -f concat -safe 0 -i "$concat_list" -i "$metadata_file" \
    -map 0 -map_metadata 1 -c copy -movflags +faststart "$output_path"

  echo "✅ Merged with chapters: $output_path"

  rm "$concat_list" "$metadata_file"
}

case $action_choice in
  1) convert_videos ;;
  2)
    if [[ -n "$converted_folder" ]]; then
      merge_videos "$converted_folder"
    else
      echo "Select a folder to merge:"
      folders=($(find "$(pwd)" -mindepth 1 -maxdepth 1 -type d -exec basename {} \; | sort -u))

      if [[ ${#folders[@]} -eq 0 ]]; then
        echo "No folders found."
        exit 1
      fi

      for i in "${!folders[@]}"; do
        printf "%d) %s\n" "$((i + 1))" "${folders[$i]}"
      done

      read -p "Enter your choice: " folder_index
      folder_index=$((folder_index - 1))

      if [[ "$folder_index" -ge 0 && "$folder_index" -lt "${#folders[@]}" ]]; then
        selected_folder="${folders[$folder_index]}"
        selected_folder="$(realpath "$selected_folder")"
        merge_videos "$selected_folder"
      else
        echo "Invalid selection!"
        exit 1
      fi
    fi
    ;;
  *)
    echo "Invalid selection!"
    exit 1
    ;;
esac