Batch downscale video to 1080p (using AMD hwaccel and hwenc)

downscale_all_to_1080p_amd_hw.sh

#!/bin/sh

set -e

OIFS="$IFS"
IFS=$'\n'

for __vidfile in $(ls -1 *.mp4); do
	if echo "$__vidfile" | grep _1080p; then
		echo 'skip converted file: ' "$__vidfile"
		continue
	fi
	echo -ne 'trying to process: \t'
	echo "$__vidfile" file
	__bitrate=$(ffprobe -v quiet -select_streams v:0 -show_entries stream=bit_rate -of default=noprint_wrappers=1:nokey=1 "$__vidfile")
	if [ -z "$__bitrate" -o ! "$__bitrate" -gt 0 ]; then
		echo cannot process "$__vidfile", failed to get the bitrate
	fi
	echo "bitrate is: $__bitrate" time to encode
	__outfile="${__vidfile%.mp4}_1080p.mp4"
	ffmpeg -hwaccel d3d11va -i "$__vidfile" -vf scale=1920x1080 -c:v h264_amf -b:v "$__bitrate" "$__outfile"
	if [ ! -f "$__outfile" ]; then
		echo cannot process "$__vidfile", ffmpeg failed
	else
		echo success, nuke old file
		rm -f "$__vidfile"
	fi
done

IFS="$OIFS"