testrecord

#!/bin/bash
# Test script to help optimize record settings and troubleshoot recording - output goes to the shell

APPNAME="${0##*/}"

cleanup()
{
    if pgrep ffmpeg &> /dev/null ;then
        killall ffmpeg
    fi

    if [[ "$RAMREC" = 'true' ]] ;then
        if [[ -d "/dev/shm/${APPNAME}" ]] ;then
            mv -f "${VFILE}" "${HOME}/Videos/"
			rm -Rf "/dev/shm/${APPNAME}"
        fi
    fi
	echo "Recorded video is ${HOME}/Videos/${APPNAME}.avi"
    exit
}
trap 'cleanup' SIGINT SIGTERM



RAMREC="false"					# Record to ram
QUEUE='1024'	     			# gets rid of ALSA xruns	
ACHANNELS='2' 					# audio channels: 1 = mono, 2 = stereo
ARATE='48000'	     			# audio sample rate
ACODEC='pcm_s16le'   			# audio codec: lossless 16 bit 
ADEV='sysdefault:CARD=USBPre2' 	# audio device: location name of ALSA device
ATYPE='alsa'					# audio device type: alsa recording - could be jack or pulse
VFPS='15'             			# frames per second
#VRES='1680x1050'      			# video resolution: comment out for auto
VSCREEN=':0.0'					# video screen
VCODEC='libx264'				# video encoder
VTYPE='x11grab'					# video grab type
VPRESET='ultrafast'   			# video encoder: ultrafast = large files, superfast, veryfast, faster, fast, medium, slow, veryslow
VTUNE='stillimage'				# video tune: film, animation, grain, stillimage, psnr, ssim, fastdecode, zerolatency -  x264 --fullhelp
VQUAL='0'  						# video quality: 0 = lossless, 16 = indistinguishable
VKEYFRAMES='90'					# keyframe interval (frames)
VIDTYPE="avi"                   # Video file type: for pcm lossless audio container needs to be avi or mkv


if [[ -z "$VRES" ]] ;then
	VRES=$(xrandr | awk '/\*/{print $1}') 
fi

VDIR="${HOME}/Videos"		
VFILE="${VDIR}/${APPNAME}.${VIDTYPE}"

if [[ "$RAMREC" = 'true' ]] ;then
	if mount | grep -q '/dev/shm' ;then
    	if [[ ! -d "/dev/shm/${APPNAME}" ]] ;then
        	mkdir -p "/dev/shm/${APPNAME}"
        fi
        VDIR="/dev/shm/${APPNAME}"
        VFILE="${VDIR}/${APPNAME}.${VIDTYPE}"
    fi
fi

ffmpeg -y -thread_queue_size "$QUEUE" -f "$VTYPE" -s "$VRES" -r "$VFPS" -i "$VSCREEN" -thread_queue_size "$QUEUE" -f "$ATYPE" -i "$ADEV" -ar "$ARATE" -ac "$ACHANNELS" -acodec "$ACODEC"  -x264opts "keyint=${VKEYFRAMES}:min-keyint=${VKEYFRAMES}:scenecut=-1"  -c:v "$VCODEC" -crf "$VQUAL" -tune "$VTUNE" -r "$VFPS" -preset:v "$VPRESET"  "$VFILE"