add camera compress

ffmpeg/compress-camera.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+
+verify_commands() {
+	commands=("ffmpeg" "ffprobe")
+	for command in "${commands[@]}"; do
+		which $command &> /dev/null
+		if [ $? -ne 0 ]; then
+			echo "command '$command' not found"
+			exit 1
+		fi
+	done
+}
+
+main() {
+	verify_commands
+
+	for arg in "$@"; do
+		for file in $(ls "$arg"); do
+			filename="${file%.*}"
+			extension="${file##*.}"
+			if [ "$extension" != "mp4" ]; then
+				echo "Invalid filetype: $file (expected mp4)"
+				continue
+			fi
+
+			width=$(ffprobe -v error -select_streams v:0 -show_entries stream=width -of default=noprint_wrappers=1:nokey=1 "$file")
+			height=$(ffprobe -v error -select_streams v:0 -show_entries stream=height -of default=noprint_wrappers=1:nokey=1 "$file")
+			rotation=$(ffprobe -v error -select_streams v:0 -show_entries stream_side_data=rotation -of default=noprint_wrappers=1:nokey=1 "$file")
+			if [ "$rotation" -eq "90" ] || [ "$rotation" -eq "-90" ]; then
+				new_width=$height
+				new_height=$width
+				width=$new_width
+				height=$new_height
+			fi
+
+			if [ "$width" -gt "$height" ]; then
+				width=1920
+				height=-1
+			else
+				width=-1
+				height=1920
+			fi
+			ffmpeg -i "$file" -vf scale="$width:$height" -c:v libsvtav1 -preset 4 -crf 23 -pix_fmt yuv420p10le -svtav1-params tune=0:film-grain=8 -c:a copy "${filename}_compressed.${extension}"
+		done
+	done
+}
+
+main $@