ffmpeg_utils.sh

#!/usr/bin/env bash

# ffmpeg.x2.cmp() {
# 	local videofiles = $@
# 	ffmpeg -i "$input" -vf "setpts=0.5*PTS" -filter:a "atempo=2.0" -vcodec libx265 -crf 28 "$output.mkv"
# 	return $?
# }

# ffmpeg.get.wav() {
# 	local videofiles = $@
# 	ffmpeg -y -i "$output.mkv" -ar 16000 -ac 2 -c:a pcm_s16le "$output.wav"
# 	return $?
# }

# ffmpeg.get.srt() {
# 	local videofiles = $@
# 	ffmpeg -i "$input" -map 0:s:0 -c:s srt -f srt -y "$output.srt"
# 	return $?
# }

# for input in $videofiles; do
# 	output="${input%.*}.cmp.x2"
# 	ffmpeg -i "$input" -vf "setpts=0.5*PTS" -filter:a "atempo=2.0" -vcodec libx265 -crf 28 "$output.mkv"
# done

# # Convert video to MP4

# set -euo pipefail

# # Supported formats
# readonly SUPPORTED_EXTS=("mkv" "avi" "mov" "flv" "wmv" "webm" "m4v" "mpg" "mpeg")
# readonly SUPPORTED_MIMES=("video/x-matroska" "video/x-msvideo" "video/quicktime" 
#                           "video/x-flv" "video/x-ms-wmv" "video/webm" "video/mp4" 
#                           "video/mpeg")

# usage() {
#     cat <<EOF
# Usage: $(basename "$0") [OPTIONS] INPUT_FILE

# Convert video file to MP4 format.

# OPTIONS:
#     -h, --help              Show this help message
#     -o, --output FILE       Output file path (default: INPUT.mp4)
#     -q, --quality PRESET    FFmpeg preset: ultrafast, fast, medium, slow (default: medium)
    
# SUPPORTED FORMATS:
#     Extensions: ${SUPPORTED_EXTS[*]}
    
# ENVIRONMENT:
#     NAUTILUS_SCRIPT_SELECTED_FILE_PATHS
#     NAUTILUS_SCRIPT_CURRENT_URI
# EOF
# }

# convert_to_mp4() {
#     local input="$1"
#     local output="${2:-${input%.*}.mp4}"
#     local quality="${3:-medium}"
    
#     [[ ! -f "$input" ]] && { echo "Error: Input file not found: $input" >&2; return 1; }
    
#     local ext="${input##*.}"
#     local supported=0
#     for e in "${SUPPORTED_EXTS[@]}"; do
#         [[ "${ext,,}" == "$e" ]] && { supported=1; break; }
#     done
#     [[ $supported -eq 0 ]] && { echo "Error: Unsupported extension: $ext" >&2; return 1; }
    
#     [[ -f "$output" ]] && { echo "Error: Output file exists: $output" >&2; return 1; }
    
#     ffmpeg -i "$input" -c:v libx264 -preset "$quality" -c:a aac -strict experimental \
#            -movflags +faststart "$output" 2>&1 | grep -v "^frame=" || return 1
    
#     echo "$output"
# }

# # Parameter processor
# process_params() {
#     local input="" output="" quality="medium"
    
#     while [[ $# -gt 0 ]]; do
#         case "$1" in
#             -h|--help)
#                 usage
#                 exit 0
#                 ;;
#             -o|--output)
#                 [[ -z "${2:-}" ]] && { echo "Error: --output requires argument" >&2; exit 1; }
#                 output="$2"
#                 shift 2
#                 ;;
#             -q|--quality)
#                 [[ -z "${2:-}" ]] && { echo "Error: --quality requires argument" >&2; exit 1; }
#                 quality="$2"
#                 shift 2
#                 ;;
#             -*)
#                 echo "Error: Unknown option: $1" >&2
#                 usage >&2
#                 exit 1
#                 ;;
#             *)
#                 [[ -n "$input" ]] && { echo "Error: Multiple input files not supported" >&2; exit 1; }
#                 input="$1"
#                 shift
#                 ;;
#         esac
#     done
    
#     [[ -z "$input" ]] && { echo "Error: No input file specified" >&2; usage >&2; exit 1; }
    
#     echo "$input|$output|$quality"
# }

# # Nautilus integration
# nautilus_handler() {
#     local input output result
    
#     if [[ -n "${NAUTILUS_SCRIPT_SELECTED_FILE_PATHS:-}" ]]; then
#         input="$(echo "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" | head -n1)"
#     elif [[ -n "${NAUTILUS_SCRIPT_CURRENT_URI:-}" ]]; then
#         input="$(echo "$NAUTILUS_SCRIPT_CURRENT_URI" | sed 's|^file://||' | xargs -0 printf '%b')"
#     else
#         notify-send -u critical "Conversion Error" "No file selected"
#         exit 1
#     fi
    
#     [[ ! -f "$input" ]] && { notify-send -u critical "Error" "File not found: $input"; exit 1; }
    
#     output="${input%.*}.mp4"
    
#     if result=$(convert_to_mp4 "$input" "$output" "medium" 2>&1); then
#         notify-send -u normal "Conversion Complete" "$(basename "$result")" \
#             -A "open=Open Folder" \
#             -A "delete=Delete Original" | while read -r action; do
#             case "$action" in
#                 open) xdg-open "$(dirname "$result")" ;;
#                 delete) rm "$input" && notify-send "Deleted" "$(basename "$input")" ;;
#             esac
#         done
#     else
#         notify-send -u critical "Conversion Failed" "$result"
#         exit 1
#     fi
# }

# # Main entry point
# main() {
#     if [[ -n "${NAUTILUS_SCRIPT_SELECTED_FILE_PATHS:-}" ]] || [[ -n "${NAUTILUS_SCRIPT_CURRENT_URI:-}" ]]; then
#         nautilus_handler
#     else
#         IFS='|' read -r input output quality <<< "$(process_params "$@")"
#         convert_to_mp4 "$input" "$output" "$quality"
#     fi
# }

# WARNING: DO NOT USE THIS!
# main "$@"

# # ID3 tag from filename regex pattern
# tag_from_filename() {
#   local pattern='(.+) - (.+) - (.+)\.mp3$'
#   local dryrun=false
  
#   while [[ $# -gt 0 ]]; do
#     case $1 in
#       -h|--help)
#         cat <<EOF
# Usage: tag_from_filename [OPTIONS] [FILES...]

# Extract artist/album/title from filenames using regex, write ID3 tags.

# Options:
#   -h, --help           Show help
#   -n, --dryrun         Show actions without executing
#   -r, --regex PATTERN  Regex with 3 capture groups: artist, album, title
#                        Default: '(.+) - (.+) - (.+)\.mp3$'

# Example:
#   tag_from_filename -r '^(\w+)-(\w+)-(.+)\.mp3$' *.mp3
# EOF
#         return 0
#         ;;
#       -n|--dryrun) dryrun=true; shift ;;
#       -r|--regex) pattern="$2"; shift 2 ;;
#       *) break ;;
#     esac
#   done
  
#   for f in "$@"; do
#     [[ "$f" =~ $pattern ]] || { echo "Skip: $f (no match)"; continue; }
    
#     local artist="${BASH_REMATCH[1]}"
#     local album="${BASH_REMATCH[2]}"
#     local title="${BASH_REMATCH[3]}"
    
#     if $dryrun; then
#       echo "Would tag: $f -> artist='$artist' album='$album' title='$title'"
#     else
#       ffmpeg -i "$f" -metadata artist="$artist" -metadata album="$album" \
#         -metadata title="$title" -codec copy -y "tagged_$f" 2>/dev/null && \
#         mv "tagged_$f" "$f"
#       echo "Tagged: $f"
#     fi
#   done
# }

# # Organize files by metadata into folder structure
# organize_by_metadata() {
#   local pattern='${artist}/${album}/${title}.mp3'
#   local dryrun=false
  
#   while [[ $# -gt 0 ]]; do
#     case $1 in
#       -h|--help)
#         cat <<EOF
# Usage: organize_by_metadata [OPTIONS] [FILES...]

# Read ID3 tags, organize into folder structure.

# Options:
#   -h, --help           Show help
#   -n, --dryrun         Show actions without executing
#   -r, --pattern STR    Path pattern with variables: artist, album, title
#                        Default: '\${artist}/\${album}/\${title}.mp3'

# Example:
#   organize_by_metadata -r '\${album}/\${title}.mp3' *.mp3
# EOF
#         return 0
#         ;;
#       -n|--dryrun) dryrun=true; shift ;;
#       -r|--pattern) pattern="$2"; shift 2 ;;
#       *) break ;;
#     esac
#   done
  
#   for f in "$@"; do
#     local artist=$(ffprobe -v error -show_entries format_tags=artist \
#       -of default=noprint_wrappers=1:nokey=1 "$f" 2>/dev/null)
#     local album=$(ffprobe -v error -show_entries format_tags=album \
#       -of default=noprint_wrappers=1:nokey=1 "$f" 2>/dev/null)
#     local title=$(ffprobe -v error -show_entries format_tags=title \
#       -of default=noprint_wrappers=1:nokey=1 "$f" 2>/dev/null)
    
#     [[ -z "$artist" || -z "$album" || -z "$title" ]] && \
#       { echo "Skip: $f (missing tags)"; continue; }
    
#     local target=$(eval echo "$pattern")
#     local target_dir=$(dirname "$target")
    
#     if $dryrun; then
#       echo "Would move: $f -> $target"
#     else
#       mkdir -p "$target_dir"
#       mv "$f" "$target"
#       echo "Moved: $f -> $target"
#     fi
#   done
# }

# # Combined: tag from filename, then organize
# tag_and_organize() {
#   local tag_pattern='(.+) - (.+) - (.+)\.mp3$'
#   local org_pattern='${artist}/${album}/${title}.mp3'
#   local dryrun=false
  
#   while [[ $# -gt 0 ]]; do
#     case $1 in
#       -h|--help)
#         cat <<EOF
# Usage: tag_and_organize [OPTIONS] [FILES...]

# Extract tags from filenames, write ID3, organize into folders.

# Options:
#   -h, --help              Show help
#   -n, --dryrun            Show actions without executing
#   -r, --regex PATTERN     Filename regex (3 groups: artist, album, title)
#   -p, --pattern PATH      Output path pattern
  
# Default regex: '(.+) - (.+) - (.+)\.mp3$'
# Default pattern: '\${artist}/\${album}/\${title}.mp3'
# EOF
#         return 0
#         ;;
#       -n|--dryrun) dryrun=true; shift ;;
#       -r|--regex) tag_pattern="$2"; shift 2 ;;
#       -p|--pattern) org_pattern="$2"; shift 2 ;;
#       *) break ;;
#     esac
#   done
  
#   for f in "$@"; do
#     [[ "$f" =~ $tag_pattern ]] || { echo "Skip: $f (no match)"; continue; }
    
#     local artist="${BASH_REMATCH[1]}"
#     local album="${BASH_REMATCH[2]}"
#     local title="${BASH_REMATCH[3]}"
#     local target=$(eval echo "$org_pattern")
#     local target_dir=$(dirname "$target")
    
#     if $dryrun; then
#       echo "Would process: $f"
#       echo "  Tag: artist='$artist' album='$album' title='$title'"
#       echo "  Move: -> $target"
#     else
#       ffmpeg -i "$f" -metadata artist="$artist" -metadata album="$album" \
#         -metadata title="$title" -codec copy -y "tagged_$f" 2>/dev/null || \
#         { echo "Failed: $f"; continue; }
#       mkdir -p "$target_dir"
#       mv "tagged_$f" "$target"
#       echo "Processed: $f -> $target"
#     fi
#   done
# }

# # Dryrun first
# tag_and_organize -n -r '^(\w+)-(\w+)-(.+)\.mp3$' *.mp3

# # Execute
# tag_and_organize -r '^(\w+)-(\w+)-(.+)\.mp3$' *.mp3

# # Custom output pattern
# tag_and_organize -p 'Music/${artist}/${title}.mp3' *.mp3