checkdvgap.sh - Check DV-AVI files which have timecode gap.

checkdvgap.sh

#!/usr/bin/env bash
#
# checkdvgap.sh - Check DV-AVI files which have timecode gap.
# Copyright (c) 2021 Koichi OKADA. All rights reserved.
# This script is distributed under the MIT license.
#

source hhs.bash 0.2.0

function sec2hms () # [-v <var>] <sec>
{
  local d h m s="${@: -1}"
  local d=$((s / 86400)); s=$((s % 86400))
  local h=$((s /  3600)); s=$((s %  3600))
  local m=$((s /    60)); s=$((s %    60))
  printf ${3:+${@:1:2}} "%d d %02d:%02d:%02d${3:-\n}" $d $h $m $s
}

function duration () # <DV-AVI file>
{
  ffprobe -hide_banner -show_format -i "$1" 2>/dev/null | awk -vFS== '$1=="duration"{print $2}'
}

function checkdvgapone () # <DV-AVI file>
{
  local fn="$1"
  local tmpfn1="$(mktemp -u).avi"
  local tmpfn2="$(mktemp -u).avi"

  local dur0; read dur0 < <(duration "$fn")
  local recdate0; read recdate0 < <(mediainfo --Inform="General;%Recorded_Date%" "$fn")
  local recstamp0; read recstamp0 < <(date -d "$recdate0" +%s)

  ffmpeg -hide_banner -i "$fn" -ss 5 -t 5 -c copy "$tmpfn1" 2>/dev/null

  local dur1; read dur1 < <(duration "$tmpfn1")
  local recdate1; read recdate1 < <(mediainfo --Inform="General;%Recorded_Date%" "$tmpfn1")
  local recstamp1; read recstamp1 < <(date -d "$recdate1" +%s)

  ffmpeg -hide_banner -ss $(bc <<< "$dur0 - 5") -i "$fn" -c copy "$tmpfn2" 2>/dev/null

  local dur2; read dur2 < <(duration "$tmpfn1")
  local recdate2; read recdate2 < <(mediainfo --Inform="General;%Recorded_Date%" "$tmpfn2")
  local recstamp2; read recstamp2 < <(date -d "$recdate2" +%s)

  local gap; let "gap = (recstamp2 - recstamp1) - (${dur0%.*} - ${dur2%.*})"
  local dur; dur=$( bc <<< "$recstamp2 - $recstamp1 + $dur2 +	5" )

  echo   "$fn"
  echo   "clip0     : $recdate0 $recstamp0 $dur0"
  echo   "clip1     : $recdate1 $recstamp1 $dur1"
  echo   "clip2     : $recdate2 $recstamp2 $dur2"
  printf "Total     : %15.6f (%s)\n" $dur  "$(sec2hms ${dur%.*})"
  printf "Duration  : %15.6f (%s)\n" $dur0 "$(sec2hms ${dur0%.*})"
  printf "Duration1 : %15.6f (%s)\n" $dur1 "$(sec2hms ${dur1%.*})"
  printf "Duration2 : %15.6f (%s)\n" $dur2 "$(sec2hms ${dur2%.*})"
  printf "Gap       : %15.6f (%s)\n" $gap "$(sec2hms $gap)"
  if (( gap > 10 )); then
      echo "May be have a gap."
  fi
  echo
  rm "$tmpfn1" "$tmpfn2"
}

function checkdvgap () # [<DV-AVI file> ...]
#   Check DV-AVI files which have timecode gap.
{
  (( $# <= 0 )) && { invoke_usage; exit; }
  local i
  for i; do
    checkdvgapone "$i"
  done
}

invoke_command "$@"