ffmpeg bash functions

gistfile1.txt

function ffclip {
  # some links about calculating durations in bash
  # https://stackoverflow.com/questions/8903239/how-to-calculate-time-difference-in-bash-script
  # http://giantdorks.org/alain/script-to-calculate-clip-duration-from-startstop-times/
  # http://giantdorks.org/alain/bash-script-to-calculate-duration-between-two-time-stamps-and-also-report-minutes-hours-days-weeks-months-and-years/
  # http://www.daveeddy.com/2014/06/29/human-readable-duration-in-bash/
  # https://gist.github.com/bezhermoso/2d61cf44646c2f07c0820d81c644c1de

  if [ "$#" -lt 3 ]; then
    echo "Usage: ffclip <file> <start> <finish>";
    return;
  fi
  colons1="${2//[^:]}";  # count colons
  colons2="${3//[^:]}";

  START_TIME=$2;

  if [ "${#colons1}" -gt 1 ]; then
    SEC1=`date +%s -ud $START_TIME`;
  else
    SEC1=`date +%s -ud 00:$START_TIME`;
  fi
  #echo "SEC1: $SEC1";

  if [ "${#colons2}" -gt 1 ]; then
    SEC2=`date +%s -ud $3`;
  else
    SEC2=`date +%s -ud 00:$3`;
  fi
  #echo "SEC2: $SEC2";

  #echo "expr ${SEC2} - ${SEC1}";
  DIFF=`expr ${SEC2} - ${SEC1}`;
  #echo "DIFF: $DIFF";
  DURATION=`date +%H:%M:%S -ud @${DIFF}`;
  #echo "DURATION: $DURATION";

  BASE=${1%.*};
  EXTN=${1##*.};
  NEW_NAME=$BASE-edit.$EXTN;

  echo "ffmpeg -ss $START_TIME -i \"$1\" -t $DURATION -c copy \"$NEW_NAME\"";
  ffmpeg -hide_banner -ss $START_TIME -i "$1" -t $DURATION -c copy "$NEW_NAME"
}

ffclip_h264() {
    if [ "$#" -lt 3 ]; then
        echo "Usage: ffclip <file> <start> <finish>";
        return;
    fi;
    colons1="${2//[^:]}";
    colons2="${3//[^:]}";
    START_TIME=$2;
    if [ "${#colons1}" -gt 1 ]; then
        SEC1=`gdate +%s -ud $START_TIME`;
    else
        SEC1=`gdate +%s -ud 00:$START_TIME`;
    fi;
    if [ "${#colons2}" -gt 1 ]; then
        SEC2=`gdate +%s -ud $3`;
    else
        SEC2=`gdate +%s -ud 00:$3`;
    fi;
    DIFF=`expr ${SEC2} - ${SEC1}`;
    DURATION=`gdate +%H:%M:%S -ud @${DIFF}`;
    BASE=${1%.*};
    EXTN=${1##*.};
    NEW_NAME=$BASE-edit.mp4;
    echo "ffmpeg -ss $START_TIME -i \"$1\" -t $DURATION -c copy \"$NEW_NAME\"";
    ffmpeg -hide_banner -ss $START_TIME -i "$1" -t $DURATION -c:v libx264 -preset fast -f mp4 "$NEW_NAME"
}

h265() {
  if [[ -z $1 ]]; then
    echo; echo "Usage: $0 <file> [crf#]";
    echo; echo;
    exit 1;
  fi;
  if [[ -z $2 ]]; then
    CRF='25';
  else
    CRF=$2;
  fi;
  BASE=${1%.*};
  EXTN=${1##*.};
  NEW_NAME="$BASE-h265-crf${CRF}.mp4";

  ffmpeg -hide_banner -i "$1" -vcodec libx265 -crf $CRF -max_muxing_queue_size 1024 -f mp4 "$NEW_NAME";
  touch -r "$1" "$NEW_NAME";
}

h264() {
  if [[ -z $1 ]]; then
    echo; echo "Usage: $0 <file> [preset]";
    echo; echo;
    exit 1;
  fi;
  if [[ -z $2 ]]; then
    PRESET='fast';
  else
    PRESET=$2;
  fi;
  BASE=${1%.*};
  EXTN=${1##*.};
  NEW_NAME="$BASE-h264-$PRESET.mp4";
  ffmpeg -hide_banner -i $1 -c:v libx264 -preset $PRESET -f mp4 "$NEW_NAME";
  touch -r "$1" "$NEW_NAME";
}