Bash script to batch transcode to H265

ffmpegBatchTranscode.sh

  #!/bin/bash

# 
# FFmpeg Batch convert files to HEVC
#
# Auto rename files to "{source}.HEVC.CQ-RF18.mp4"
#
# Batch transcode video files recursively from input directory, and create a
# empty, mirrored directory tree of input directory to new "output" directory. 
#
# Usage:
#
# bash ffmpegBatchTranscode.sh directory
#

if [ -z "$1" ]; then
    echo "Please pass in a directory to scan"

    exit 1
fi

ffmpegTranscode()
{
    INPUT="$1"
    INPUT_FILENAME=$(basename "$INPUT")
    INPUT_FILENAME_WITHOUT_EXTENSION=$(echo "$INPUT_FILENAME" | sed -e 's/\(.*\)\..*/\1/')

    # Remove first directory
    OUTPUT_DIRECTORY=$(dirname "$INPUT" | sed -E 's/\/?[^\/]+\///')

    OUTPUT_PATH="h265/$OUTPUT_DIRECTORY/${INPUT_FILENAME_WITHOUT_EXTENSION}.HEVC.CQ-RF18.mp4"

    mkdir -p $(dirname "$OUTPUT_PATH")

    ffmpeg -nostdin -i "$INPUT" -c:v libx265 -crf 18 -preset fast -c:a copy "$OUTPUT_PATH"
}

find "$1" -type f | while read line; do ffmpegTranscode "$line"; done