reencode 10-bit anime mkvs into 10-bit versions using HandBrakeCli and this only when needed

transcode10to8.sh

#!/bin/bash
# ----------
# This script uses HandBrakeCLI to convert any mkv x264 video to 8-bit (high @ 4.1 Profile)
# and this only when needed!!
#-----------
# based on the script by enolive located here http://pastebin.com/2rCh13Pk
# ----------
# Needed tools:
# HandBrakeCLI get it here http://handbrake.fr/downloads2.php
# ----------
# Usage:
# <this_file> -i FILE
# ----------

NO_ARGS=0 
E_OPTERROR=85
USAGE="$(basename $0) [-i file] [-o file] [-d] [-t] [-t] [-h] -- reencode 10-bit anime mkvs into 10-bit versions using HandBrakeCli

where:
    -h  print this help and exit
    -i  input file
    -o  output file. if it is ommited output will be the <input_file_basename>[8-bit].mkv
    -r  replace. replace the input file. a temp file is writen and then replaced with the temp file. -o is irgnored
    -d  debug. show final CMD, HandBreak output and keep scan.txt file
    -t  test. only transcode the first 30s
    -p  profile. currently only \"magao\"
                - magao: high quality profile. from http://forum.xbmc.org/showthread.php?tid=106051&pid=1061440#pid1061440"


if [ $# -eq "$NO_ARGS" ]    # Script invoked with no command-line args?
then
  echo "$USAGE"
  exit $E_OPTERROR          # Exit and explain usage.
                            # Usage: scriptname -options
                            # Note: dash (-) necessary
fi  


#defaults
REPLACE=0
INPUT=''
OUTPUT=''
TEST=false
DEBUG=0
PROFILE=''


# initialize variables
while getopts ":ro:i:tdp:h" Option
do
  case $Option in
    o     ) output="$OPTARG";;
    i     ) input="$OPTARG";;
    t     ) test=1;;
    d     ) debug=1;;
    p     ) profile="$OPTARG";;
    r     ) replace=1;;
    h     ) echo "$USAGE"; exit $E_OPTERROR;;
    *     ) echo "Unimplemented option chosen.";;   # Default.
  esac
done


if [ ${replace:-0} == 0 ]
then
    if [ "$output" = "" ]
    then
        output=$input
        output=${output##*/}
        output=${output%.mkv}[8-bit].mkv
    fi
else
    output=$input
    output=${output##*/}
    output=${output%.mkv}temp.mkv
fi
# TODO: find a way to save HandBrakes output int a var ... problem is it does not use stdout
HandBrakeCLI --scan -i "$input" &>scan.txt # save scan result in scan.txt
if cat scan.txt | grep -q "High 10"
then
    echo "Processing $input -> $output ..."
    
    # mux subtitels 1-3 ... ther is no way to say mux all subtitels sry for stuff with more then 3 subs
    # set default sub to teh first
    # passthru audio
    # constant framerate
    CMD="HandBrakeCLI -f mkv -s \"1,2,3\" --subtitle-default 1 -E copy:* -e x264 --x264-tune animation --x264-profile high --cfr -o \"$output\" -i \"$input\""
    if [ $test == 1 ]
    then
        echo "test run first 30s"
        CMD="$CMD --stop-at duration:30"
    fi
    
    if [ "$profile" != "" ]
    then
        echo "Profile choosen: $profile"
    fi
    # add new profiles here   
    case $profile in
        # from http://forum.xbmc.org/showthread.php?tid=106051&pid=1061440#pid1061440 .. well thats what i think it is :3
        magao     ) CMD="$CMD -x ref=6:weightp=1:rc-lookahead=10:trellis=0:8x8dct=0:bframes=5:b-adapt=2:me=umh:merange=9:psy-rd=0.5,0.00";;
        *        ) ;;   # Default. use HandBrakes Defaults
    esac
    
    
    if [ ${debug:-0} == 0 ]
    then
        CMD="$CMD &>/dev/null"
    else
        echo "Final CMD: $CMD"
    fi
    
    echo "Processing in progress, this can take very long, plz wait..."
    # run transcoding
    # use eval beacuse of spaces in file names ...
    eval $CMD
    
    if [ $replace == 1 ]
    then
        rm -f "$input"
        mv "$output" "$input"
        output=$input
    fi    
    echo
    echo "########################"
    echo "Processing DONE ^_^"
    echo "8bit file at: $output"
    echo "########################"
else
    echo
    echo "########################"
    echo "NOT processing $input its not 10bit :3"
    echo "########################"
fi

if [ ${debug:-0} == 0 ]
then
    if [ -e "scan.txt" ]
    then
        rm -f "scan.txt"
    fi
fi

# all done
exit 0

To save in var redirect stderr to stdout 2>&1
scan=$(HandBrakeCLI --scan -i "$input" 2>&1)