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README.md

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+# video-convert
+
+Bash script to convert a video to mp4 and webm
+
+This script takes a list of inputs with filenames like "filename-1080p.mp4" and uses ffmpeg to convert them to the following formats (as applicable):
+
+- 1080p mp4
+- 1080p webm
+- 720p mp4
+- 720p webm
+- 480p mp4
+- 480p webm
+- 360p mp4
+- 360p webm
+
+It maintains good quality for the resulting videos. Converting to webm will generally take a very long time.
+
+## Usage
+
+`video-convert FILE [FILE...]`
+
+The file names MUST end in -<height>p.<mp4|webm> as this is how this script determines the source resolution and container type.
+
+This script converts to two formats:
+- mp4 (h264/aac), which is non-free but widely supported
+- webm (vp9/opus), which is free but less widely supported
+
+It only converts to the same or lower height than the source. If you run `video-convert myvideo-720p.mp4`, for example, it will create the following files:
+- myvideo-720p.webm
+- myvideo-480p.mp4
+- myvideo-480p.webm
+- myvideo-360p.mp4
+- myvideo-360p.webm
+
+## License
+
+public domain or CC0

video-convert

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+# convert_to_mp4 filename-1080p.mp4 720 1280
+convert_to_mp4() {
+	infile="$1"
+	height="$2"
+	width="$3"
+	outfile="${infile%-*}-${height}p.mp4"
+	ffmpeg -i "$infile" -vf scale=$width:$height -preset slow -crf 18 "$outfile"
+}
+
+# convert_to_webm filename-1080p.mp4 720 1280
+convert_to_webm() {
+	infile="$1"
+	height="$2"
+	width="$3"
+	outfile="${infile%-*}-${height}p.webm"
+	ffmpeg -i "$infile" -vf scale=$width:$height -b:v 0 -crf 30 -pass 1 -an -f webm -y /dev/null
+	ffmpeg -i "$infile" -vf scale=$width:$height -b:v 0 -crf 30 -pass 2 "$outfile"
+}
+
+# do for each argument
+while(($#));do
+	# filename-1080p.mp4
+	filename="$1"
+
+	# mp4
+	ext="${filename##*.}"
+
+	# 1080
+	res="${filename##*-}"
+	res="${res%p.*}"
+
+	# filename
+	name="${filename%-*}"
+
+	for height in 1080 720 480 360;do
+		case $height in
+			1080) width=1920 ;;
+			720) width=1280 ;;
+			480) width=854 ;;
+			360) width=640 ;;
+		esac
+		if [[ $res -ge $height ]];then
+			if [ ! -e "$name-${height}p.mp4" ];then
+				convert_to_mp4 "$filename" $height $width
+			fi
+			if [ ! -e "$name-${height}p.webm" ];then
+				convert_to_webm "$filename" $height $width
+			fi
+		fi
+	done
+	shift
+done