encoding AVI to MP4 shell script

encoding.sh

#!/bin/sh

ffprobe="/volume1/NAS/SH/dts/ffprobe"
ffmpeg="/volume1/NAS/SH/dts/ffmpeg"
cachedir="/volume1/NAS/SH/dts"

##  cleanup by deleting unwanted files
find $1 -name "*.txt" -type f -print0 | xargs -0 rm -rf
find $1 -name "*.db" -type f -print0 | xargs -0 rm -rf
##find $1 -name "*.nfo" -type f -print0 | xargs -0 rm -rf
find $1 -name "*sample*.mkv" -type f -print0 | xargs -0 rm -rf
find $1 -name "*Sample*.mkv" -type f -print0 | xargs -0 rm -rf
find $1 -name "*SAMPLE*.mkv" -type f -print0 | xargs -0 rm -rf


##  go over all MKVs
find $1 -name "*.avi" -type f  | while read f
##find $1 -name "*.avi" -type f  | for ((a=0,a<10;a++))
##find $1 -name "*.mkv" -type f | while read f
do





echo =================================================================================
echo processing $f

## check lock
echo "checking for ""${f%\/*}"/lock""
if [ -f ""${f%\/*}"/lock" ];
 then
  echo "file is locked. skipping."
  continue
 fi

## create lock
touch ""${f%\/*}"/lock"

## uncomment following 2 lines for subliminal call
## echo -e "executing subs /volume1/@appstore/subliminal/env/bin/subliminal -f -l eng ${f%\/*}/"
## /volume1/@appstore/subliminal/env/bin/subliminal --cache-dir $cachedir -f -l eng ""${f%\/*}"/"

##  Detect what audio codec is being used:
audio=$($ffprobe "$f" 2>&1 | sed -n '/Audio:/s/.*: \([a-zA-Z0-9]*\).*/\1/p' | sed 1q)
streams=$($ffprobe "$f" 2>&1 | sed -n 's/.*Stream #0:\([0-9]*\).*/\1/p' | tail -n 1)

##  Set default video settings:
##vopts="-c:v copy"
##vopts="-c:v libx264 -crf 19 -preset slow"
vopts="-c:v libx264 -crf 21 -preset slow"

##  Set default subtitle settings:
sopts="-c:s mov_text"

## others: copy all
eopts="-map 0 -c copy"

echo "-----> audio is $audio"
echo "-----> there are $(($streams+1)) streams"

case "$audio" in
 "" )
##  If there is no detected audio stream, don't bother
  echo "-----> can't determine audio, skipping"
 ;;
 * )
##  anything else, convert

  case "$audio" in
##  AC3: keep original, add ACC
   ac3 )
    aopts="-map 0:a -c:a:1 copy            -c:a:0 aac -ac:a:0 2 -strict -2"
   ;;
##  anything else, put AC3 and AAC in place
   * )
    aopts="-map 0:a -c:a:1 ac3 -b:a:1 640k -c:a:0 aac -ac:a:0 2 -strict -2"
   ;;
  esac
   ##echo -e "-----> executing $ffmpeg -y -i $f $eopts $sopts $vopts $aopts ${f%.mkv}.mp4"
   echo -e "-----> executing $ffmpeg -y -i $f $eopts $sopts $vopts $aopts ${f%.avi}.mp4"
   ##$ffmpeg -nostdin -y -i "$f" $eopts $sopts $vopts $aopts "${f%.mkv}.mp4" > /dev/null 2>&1
   $ffmpeg -nostdin -y -i "$f" $eopts $sopts $vopts $aopts -ss 5 -t 5 "${f%.avi}.mp4" > /dev/null 2>&1
   fail=$?
   case "$fail" in
   "0" )
##  put new file in place
     echo "-----> SUCCES"
     ##rm -rf "$f"
     ##synoindex -D "$f"
     ##chmod 666 "${f%.mkv}.mp4"
     chmod 666 "${f%.avi}.mp4"
     ##synoindex -A "${f%.mkv}.mp4"
     synoindex -A "${f%.avi}.mp4"
     ;;

    * )
     echo "-----> FAIL"
##  revert back
     ##rm -rf "${f%.mkv}.mp4"
     rm -rf "${f%.avi}.mp4"
     ;;
   esac
  ;;
 esac

##  release lock
rm -rf ""${f%\/*}"/lock"

##done

done


exit 0