make-screencast

#!/bin/bash

TIME=$(date +%Y-%m-%d_%H-%M-%S)

case "$1" in
	--trim)
		if [[ "$2" -ne "0" || -z "$2" ]]; then
			echo "Missing or incorrect parameters."
			exit
		fi
		echo "file: $2, start: $3, end: $4"
		# Trim to specific start and end times in FFMPEG.
		ffmpeg -y \
			-noaccurate_seek \
			-ss "$3" \
			-i "$2" \
			-to "$4" \
			-acodec copy \
			-vcodec copy \
			-movflags faststart \
			-avoid_negative_ts make_zero \
			video_trimmed_$TIME.mp4
			exit
	;;
	--record)	
		# capture screen data
		ffmpeg -y \
			-f x11grab \
			-s $(xdpyinfo | grep dimensions | awk '{print $2}') \
			-i :0.0 \
			-f pulse -ac 1 -ar 48000 \
			-i default \
			-filter_complex "compand=attacks=0:points=-60/-40|-30/-15|-15/-10|-5/-8|0/-6" \
			-c:v libx264 -r 30 \
			-c:a mp3 \
			video_capture_$TIME.mp4
			exit
	;;
	*)
		echo "usage: make-screencast < --record | --trim > < videofile > < start time hh:mm:ss > < duration hh:mm:ss >"
		echo "The script will record or trim the video, saving it as an mp4 file."
		echo "Trim only the original, not trimmed output, otherwise loss of quality will result!"
		exit
	;;
esac