cap

#!/bin/bash
# set -x 
audio_offset=0.45
wait_time=2
args=`getopt o:t: $*`
quality=
app=$(basename $0)
usage() {
	echo ""
    echo "Usage: $app [-o audio_offset] [-t seconds] output_base"
	out="output_base".$(date +%F-%H%M.%S)
	echo ""
	echo "    recoding will be: ${out}.mkv"
	echo ""
    exit 2
}

if [ $? != 0 ]
then
        usage
fi
set -- $args

for i; do
	case "$i"
	in
	-o)
		echo Setting audio offset to "'"$2"'"; audio_offset="$2"; shift;
		shift;;
	-t)
		echo Setting wait time to "'"$2"'"; wait_time="$2"; shift;
		shift;;
	--)
		shift; break;;
	esac
done

if [ $# = 0 ]; then
    usage
fi

out="$@".$(date +%F-%H%M.%S)

SwitchAudioSource -s 'Soundflower (2ch)'
cat <<EOF


##
## Hit ctrl-C to stop recording "$out.mkv".
## Waiting for $wait_time seconds...
##


EOF
sleep $wait_time
ffmpeg \
	-hide_banner \
	-loglevel info \
	-thread_queue_size 512 \
	-f avfoundation \
	-i "1" \
	-thread_queue_size 512 \
	-f avfoundation \
	-ac 2 \
	-itsoffset $audio_offset \
	-i ":2" \
	-c:a aac \
	-c:v libx264 \
	-crf 0 \
	-preset ultrafast \
	-threads 0 "$out".mkv
SwitchAudioSource -s 'External Headphones'