Video Downsampler in Bash

video_downsample.sh

#!/usr/local/bin/bash
# oxagast / marshall@oxasploits.com
#
#
maxres="480p" ## Target Resolution
audiochs=2    ## Max Audio Channels
maxsize=600   ## Max filesize in megabytes
#

cleanup()
{
  printf "\nCaught CTRL+C cleaning up... "
  rm -f "downsample/*.mp4"
  echo "Exiting..."
  exit 1
}
trap cleanup SIGINT
res=$(echo $maxres | tr -d 'p')
if [[ $(pgrep ffmpeg | wc -l) -ne 0 ]]; then
  echo "Already encoding!"
  exit 1
fi
mkdir -p orig
mkdir -p downsample
count=0
totfiles=$(ls -1 *.{mp4,mpg,avi,mkv} 2>/dev/null | wc -l | tr -d ' ')
for file in *.{mp4,mpg,avi,mkv}; do
  ((count++))
  filename=$(basename -- "$file")
  extension="${filename##*.}"
  filename_no_ext="${filename%.*}"
  if [[ -f "downsample/${file}" ]]; then
    rm -f "downsample/${file}"
  fi
  if [[ $(echo "${file}" | grep -E "[[:digit:]]{4}") ]]; then
    date=$(echo "${file}" | tr '.' ' ' | sed -E 's|.* ([[:digit:]]+) mp4|\1|' || echo "${file}" | grep -oE \
      "[[:digit:]]{4}")
    title=$(echo "${file}" | tr '.' ' ' | sed -E 's|(.*) [[:digit:]]{4} mp4|\1|' || echo "${filename_no_ext}")
  else
    date=""
    title=""
  fi
  if [[ -f "${file}" ]]; then
    osize=$(stat -f "%z" "${file}" | tr -d '\n')
    osizemb=$(stat -f "%z" "${file}" | gnumfmt --to-unit M --format "%8.0f" | xargs printf "\r%s")
  else
    osize=0
    osizemb=0
  fi
  if [ $osizemb -gt $maxsize ]; then
    if [[ $(ffprobe -v fatal -select_streams v:0 -show_entries stream=height -of csv=s=x:p=0 "${file}") -gt $res ||
    $(ffprobe  -v fatal -select_streams a:0 -show_entries stream=channels -of default=noprint_wrappers=1:nokey=1 \
      "${file}" 2>/dev/null) -gt 2 ]]; then
      if [ ! -s "downsample/${filename_no_ext}.mp4" ] || [[ ! $(ffprobe -v fatal -show_entries format=duration -of \
        default=noprint_wrappers=1:nokey=1 "${file}" 2>&1 >/dev/null) ]]; then
        if [ ! -f "orig/${file}" ] || [[ $(ffprobe -ignore_chapters 1 -v fatal -show_entries format=duration -of \
          default=noprint_wrappers=1:nokey=1 "${file}" | cut -d '.' -f 1) -ne $(ffprobe -v \
            error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "orig/${file}" |
            cut -d '.' -f 1) ]]; then
          #FRAMECOUNT=$(mediainfo --Output="Video;%FrameCount%"  "${file}" | tr -d '\n')
          pv -s "${osize}" -aepN "Downsampling: ($count/$totfiles) ${title} [$date]" "${file}" | ffmpeg -i pipe:0 -y \
            -nostats -hide_banner -loglevel fatal -ignore_chapters 1 -vf "scale=-2:$res:flags=lanczos+accurate_rnd" \
            -c:v libx264 -preset slow -filter:v fps=24 -crf 31 -maxrate 2M -bufsize 4M -c:a aac -ac $audiochs -b:a \
            128k -metadata year=$date -metadata title="${title}" "downsample/${filename_no_ext}.mp4" && mv \
            "${file}" "orig/" 2>/dev/null && mv -f "downsample/${filename_no_ext}.mp4" "${filename_no_ext}.mp4" \
            2>/dev/null || mv -f "orig/${file}" "${file}" 2>/dev/null
        fi
      fi
    fi
  fi
done