AMD FFMPEG+VAAPI screen recording with microphone input

record.sh

#!/bin/bash
# AMD + FFMPEG VAAPI screen+alsa+pulseaudio recording script

# In your home directory create .asoundrc with following contents:
#  pcm.!default pulse
#  ctl.!default pulse
# This allows alsa to use pulseaudio as the input device.

# Bind any hotkey to the script. 
# Launch once - recording starts. Launch twice - recording stops.

FRAMERATE="60"

# lower = better quality
QUANTIZATION="12"
# 2 == visually lossless
# 1 == lossless
QSCALE="2"

VIDEO_CODEC="h264_vaapi"
AUDIO_CODEC="libfdk_aac"
AUDIO_BITRATE="320k"
VIDEO_BITRATE="20k"

OUT=$(date +"%Y-%m-%d %T")

# Create temporary file indicating whether the record is running
# Check whether the file exists
if [ -f "/tmp/record" ]; then
	echo "Recording is in process, stopping..."
	pid=$(cat /tmp/record)
	kill -15 $pid
	rm /tmp/record
	# send notification
	#notify-send "Recording stopped"
elif [ ! -f "/tmp/record" ]; then
	echo "Started recording"
	exec ffmpeg -nostdin \
	     -hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128 \
		 -y -f alsa -i pulse -f alsa -i pulse -filter_complex amix=inputs=2:duration=longest \
		 -f x11grab -framerate $FRAMERATE -i :0.0 -vf 'format=nv12,hwupload' \
		 -c:v $VIDEO_CODEC -coder cavlc -profile:v constrained_baseline -movflags faststart -qp $QUANTIZATION \
		 -c:a $AUDIO_CODEC -b:a $AUDIO_BITRATE -b:v $VIDEO_BITRATE -q:v $QSCALE "$OUT.mp4" &

	# launch ffmpeg separately from script to change stream sources
	disown
	# put ffmpeg PID into temp file
	echo $! > /tmp/record
	# wait for ffmpeg instance to initialize
	sleep 1
	# get a list of recording streams made by current ffmpeg instance
	sinks=$(pactl list source-outputs | grep -B 18 "ffmpeg" | grep "Source Output" | cut -d '#' -f 2)
	sink1=$(echo "$sinks" | head -n 1)
	sink2=$(echo "$sinks" | tail -n 1)
	# move first stream to the recording device (microphone)
	pactl move-source-output $sink1 0
	# move second stream to the playback device (speakers)
	pactl move-source-output $sink2 1
	# as a result ffmpeg streams capture microphone+speakers sound
	# which then are being mixed together with "filter_complex amix" 
	notify-send "Recording started"
fi
exit 0