chapters

#!/bin/sh
help() { cat <</help
Show chapter information for given media
Usage: chapters [OPTIONS] [FILE...]
  -a, --all        Display each file's chapters (default if given one file)
  -v, --verbose    Show chapters to the millisecond, show files lacking chapters

Now also displaying the number of video, audio, and text tracks.

A part of media-scripts, https://github.com/adamhotep/media-scripts
chapters v0.6.20220814 copyright 2010+ by Adam Katz, GPLv2+
/help
exit
}

all=0
verbose=0
precision='2.0'
while getopts ahv-: OPT; do
  case $OPT$OPTARG in
    ( a | -all* )	all=1 ;;
    ( h | -help* )	help ;;
    ( v | -verb* )	verbose=1 precision='6.3' ;;
    ( -* )		echo "Illegal option --$OPTARG" >&2; exit 2 ;;
    ( * )		exit 2 ;;
  esac
done
shift $((OPTIND-1))

if ! command -v mediainfo >/dev/null 2>&1; then
  echo 'ERROR: command `mediainfo` is required for this program.' >&2
  exit 2
fi

# Default to all (non-hidden) files in current directory if not given arguments
if [ $# = 0 ]; then
  set -- *
fi

#CHAPTER_RE='/^ *[0-9][0-9]*:.*Chapter /'
CHAPTER_RE='/^[0-9][0-9]:[0-9][0-9]:[0-9][0-9]\.[0-9]+[[:space:]]+:/'
awk_function_time='
  function time(t) {
    m = int(t/60)
    s = t - 60 * m
    if (m > 60) {
      h = int(m/60)
      m -= h * 60
      return sprintf ("%2d:%02d:%0'"$precision"'f", h, m, s)
    } else {
      return sprintf ("%5d:%0'"$precision"'f", m, s)
    }
  }
'
awk_set_duration='
  # the first "Duration" should be the overall duration
  $1 == "Duration" && !duration && NF==2 && $2 !~ /[^.0-9]/ {
    duration = $2 / 1000	# ms -> s
  }
'

if [ "$all" = 1 ] || [ $# = 1 ]; then
  for file in "$@"; do
    if [ $# -gt 1 ]; then
      echo "$break$file:"
      break="\n"
    fi
    mediainfo -f "$file" 2>/dev/null |awk -F ' *: *' -v file="$file" "
      $awk_function_time
      $awk_set_duration

      $CHAPTER_RE"' {
        chap = $1 * 3600 + $2 * 60 + $3
        # Some movies have their chapters listed twice. Do not double count.
        if (chap == 0 && last == 0 || chap > last) {
          if (name) print time(chap - last) "  " name
          name = $0
          sub('"$CHAPTER_RE"', "Chapter ", name)
          last = chap
        }
      }

      END {
        if (name) {
          print time (duration - last) "  " name
          print time (duration) "  (Total)"
        }
        else {
          print time (duration) "  " file
          exit 1
        }
      }'
    RETVAL=$?
    if [ $RETVAL != 0 ]; then
      EXIT=$RETVAL
    fi
  done
  exit $EXIT
fi

echo ' Ch  V  A  T     Time  Filename'
for f in "$@"; do
  mediainfo -f "$f" 2>/dev/null |awk -F ' *: *' -v file="$f" "
    $awk_function_time
    $awk_set_duration
    $CHAPTER_RE"' {
      chap = $1 * 3600 + $2 * 60 + $3
      if (chap == 0 && last == 0 || chap > last) {
        chapter++
        last = chap
      }
    }

    NF == 1 && /^Video/ { video++ }
    NF == 1 && /^Audio/ { audio++ }
    NF == 1 && /^Text/  { text++ }
    END {
      if (chapter || video || audio || text || '"$verbose"')
        printf "% 3d% 3d% 3d% 3d %8s  %s\n",
          chapter, video, audio, text, time(duration), file
    }
  '
done