Encodes MKV files from a folder using ffmpeg and NVENC H265 encoder

h265_nvenc.sh

#!/bin/bash
set -e

# Reencodes a folder with mkv files, *not* using 10bit pixel format
# Usage: ./h265_nvenc.sh <path of mkv files>

DIR=$(realpath "$1")
FILES=`find "$DIR" -type f -not -path '*/\.*' -name "*.mkv"`
IFS='
'

encode() {
    #ffmpeg -y -hwaccel cuvid -hwaccel_output_format cuda -i "$f" -map 0 -c copy -c:v hevc_nvenc "$output_temp"
    ffmpeg  -i "$1" -pass 1 \
        -c:v hevc_nvenc -profile:v main -preset slow -rc vbr -multipass 2 \
        -qmin 15 -qmax 20 -pix_fmt yuv420p -2pass 1 -c:a:0 copy -f mp4 -y /dev/null &&
    ffmpeg  -i "$1" -pass 2 -map 0 -c copy \
        -c:v hevc_nvenc -profile:v main -preset slow -rc vbr -multipass 2 \
         -qmin 15 -qmax 20 -pix_fmt yuv420p -2pass 1 -c:a:0 copy -y "$2"
}

echo "DIR: $DIR"

for f in $FILES
do
        output_temp=$(mktemp "$DIR/.tmp.XXXXXX.mkv")
        echo "Target: \"$f\", Temporal: \"$output_temp\""
        encode "$f" "$output_temp"
        mv "$output_temp" "$f"
        rm -f "$output_temp"
done