Convert x264 to x265 files found in a folder with ffmpeg

convert_x265_to_x264

#!/bin/bash

FOLDER=$PWD/*.mkv

for filename in $FOLDER; do
    echo "Processing $filename file..."
    INPUT=$filename
    OUTPUT="${filename/.mkv/_x264.mkv}"
    echo "Processing echo "${filename/.mkv/_x264.mkv}"  file..."
    ffmpeg -y -i $INPUT -c:v libx264 -crf 18 -c:a copy $OUTPUT
done