encode input file to hevc

tox265.sh

#!/bin/bash
set -euo pipefail
infile="$1"
preset=veryfast
audiobitrateperchannel=64
ffmpeg_docker='lloesche/nginx-fatpack'

originfile=$infile
[ ! -f "$infile" ] && \
        echo "file $infile not found" && \
        exit 1

if type ffmpeg > /dev/null 2>&1 && type ffprobe > /dev/null 2>&1
then
	ffmpeg=ffmpeg
	ffprobe=ffprobe
else
	ffmpeg="docker run -it -v /:/host $ffmpeg_docker ffmpeg"
	ffprobe="docker run -i -v /:/host $ffmpeg_docker ffprobe"
	pwd=$(pwd)
	if [ ${infile:0:1} == '/' ]
	then
		infile="/host${infile}"
	else
		infile="/host${pwd}/${infile}"
	fi
fi

if ! codec=$($ffprobe -i "$infile" -show_streams -select_streams v:0 2> /dev/null | grep codec_name= | cut -d = -f 2)
then
	echo "can't determin codec"
	exit 1
fi

if [ "$codec" == "hevc" ]
then
	echo "$infile is already h.265"
	exit 1
fi

outdir="$(dirname "$infile")"
origoutdir="$(dirname "$originfile")"
outfile="$(basename "$infile").x265.mkv"
audiochannels=$($ffprobe -i "$infile" -show_streams -select_streams a:0 2> /dev/null | grep ^channels= | cut -d = -f 2)
audiobitrate=$(($audiochannels*$audiobitrateperchannel))k
$ffmpeg -i "$infile" -c:v libx265 -x265-params crf=23 -preset $preset -c:a libfdk_aac -b:a $audiobitrate "$outdir/.$outfile" && \
mv -f "$origoutdir/.$outfile" "$origoutdir/$outfile"