convert videos x265 to x264 and change filename

convert-x265.sh

#!/usr/bin/env bash
### Initialize stuff
CUR_DIR=$PWD

OPTIONS="r:f:"
VIDEO_SUFFIXES='mkv|avi|mp4|mov'

HELP_MSG="Usage %s: [-D] [-r regex-remove] [-a regex-array-remove] [-d dir] [-f filename] args

Should work on all video files with suffixes ${VIDEO_SUFFIXES}. Give
it a file or a directory and it will convert all video files it finds
and save it with new filename."


help() {
	printf $HELP_MSG
 $0

	exit 1;
}

### Handle option stuff

# Copied from man 1 getopts
while getopts Dur::af::d::h name
do
	case $name in
		r) rflag=1
		   regex="$OPTARG";;
		a) aflag=1
		   regex_array="$OPTARG";;
		d) dflag=1
		   dir="$OPTARG";;
		D) echo Enablind DEBUG
		   set -x
		   DEBUG=true;;
		f) fflag=1
		   filename="$OPTARG";;
		u) ultrafast=1
		   ULTRAFAST="-preset ulrafast";;
		h|?) help;;
	esac
done

if [ -v DEBUG ]; then
    if [ -n "$rflag" ]; then
	printf 'Option -r "%s" specified\n' "$regex"
    fi
    if [ -n "$dflag" ]; then
	printf 'Option -d "%s" specified\n' "$dir"
    fi
    if [ -n "$ultrafast" ]; then
	printf 'Option -u "%s" specified\n' "$ULTRAFAST"
    fi
    if [ -n "$aflag" ]; then
	printf 'Option -a "%s" specified\n' "$regex_array"
    fi
    if [ -n "$fflag" ]; then
	printf 'Option -f "%s" specified\n' "$filename"
    fi
    printf 'Remaining arguments are: %s\n' "$*"
fi

shift $(($OPTIND - 1))

### The Program

REGEX_RESULT=""
function apply_regex () {
    [[ -v DEBUG ]] && printf 'INFO: applying regex: %s\n' "$regex"
    printf -v REGEX_RESULT $(sed -E "s/$regex//" <<< $1)
    # ERROR: regex fail
    [[ $? != 0 ]] && log_exit "regex failed" $regex $fflag
}

function main() {
    if [[ -n "$dir" ]]; then
	DIR="$dir"
    else
	DIR="$(dirname "$1")"
    fi
    OLD_NAME="$(basename "$1")"
    is_video "$OLD_NAME";
    NEW_NAME="$(sed -E 's/(720|1080)p/480p/g ; s/([xXhH]26)5/\14/g ; s/hevc/h264/g ' <<< $OLD_NAME)"
    # ERROR: create new name fail
    [[ -z $NEW_NAME ]] && log_exit "something went wrong, creating new name" "$OLD_NAME" $fflag
    # ERROR: both names equal
    [[ $OLD_NAME = $NEW_NAME ]] && log_exit "couldnt change the name" "$OLD_NAME" $fflag

    # If regex is set apply that as well
    if [[ $rflag == 1 ]]; then
	apply_regex $NEW_NAME
	NEW_NAME=$REGEX_RESULT
    fi

    cd "${CUR_DIR}/${DIR}"
    file_exists $NEW_NAME

    # Run program if not debugging
    if [[ ( $OLD_NAME != $NEW_NAME ) && ( ! -v DEBUG ) && ( $SKIP == 0 ) ]]; then
	ffmpeg -i "$OLD_NAME" $ULTRAFAST -c:v h264 -s 800x480 "$NEW_NAME"    
    # If DEBUG then output info
    elif [[ -v DEBUG && $SKIP == 0 ]]; then
	echo Old Name:	$OLD_NAME
	echo New Name:	$NEW_NAME
	echo Operating Dir: $CUR_DIR
	echo Directory:	$DIR
	echo INFO: ffmpeg -i "$OLD_NAME" $ULTRAFAST -c:v h264 -s 800x480 "$NEW_NAME"
    fi
}

function file_exists() {
    FILENAME=$1
    [[ -a "$FILENAME" ]] && log_exit "file exists" "$FILENAME" $fflag
}

function is_video() {
    # Check that it is a video file
    grep -qE '($VIDEO_SUFFIXES)$' <<< $1 ||
	# ERROR: File exists
	log_exit "Not a video" "$1" $fflag
}

function log_exit() {
    ERROR_MSG=$1
    THING=$2
    printf 'ERROR: %s: %s\n' "$ERROR_MSG" "$THING"
    # Exit if necessary
    [[ $3 == 1 ]] && exit $RET_CODE || SKIP=1
}

if [[ -n $filename ]]; then
    [[ -n $DEBUG ]] && echo Running main on $filename
    main "$filename"
elif [[ -n $dir ]]; then
    [[ -n $DEBUG ]] && echo Running for loop over directory
    for file in $dir/* ; do
	SKIP=0
	[[ -a "$DEBUG" ]] && echo Running main on $file
	main "$file"
    done
fi