ffmpeg wrapper to convert video files to hevc codec with an AMD GPU

tohevc.sh

#!/bin/bash

# ffmpeg wrapper to convert video files to hevc codec with an AMD GPU.
#   usage: tohevc input output

# MIT License
# 
# Copyright (c) 2024 Nikolas Koesling <[email protected]>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# check args
if [ $# -ne 2 ]
then
    >&2 echo 'usage: tohevc input output'
    exit 64
fi

if [ "$1" == "--help" ] || [ "$2" == "--help" ] || [ "$1" == "-h" ] || [ "$1" == "-h" ]
then
    echo 'usage: tohevc input output'
    exit 0
fi

ffmpeg \
    -vaapi_device /dev/dri/renderD128 \
    -i "$1" \
    -vf 'format=nv12,hwupload' \
    -map 0 \
    -c:v hevc_vaapi \
    -c:a copy \
    -c:s copy \
    -global_quality 25 \
    -profile:v main \
    "$2"