ffmpeg for hardware encoding

#!/bin/bash

for e in `find /home/image/testmount -name *.$1 -print`
do
    ffmpeg -i $e -c:v hevc_nvenc -rc:v vbr_hq -cq:v 19 -b:v 2500k -maxrate:v 5000k -profile:v high -c:a aac -b:a 128k /home/image/temp-video-output/`basename $e | sed -e s/"$1"/"-hevc.mkv"/`
    sleep 4s
done