val=$(expr "$psnr" : ".*$3: *\([0-9.]*\)")
size1=$(expr "$psnr" : '.*bytes: *\([0-9]*\)')
size2=$(expr "$psnr" : '.*bytes:[ 0-9]*/ *\([0-9]*\)')
val=$(expr "$psnr" : ".*$3: *\([0-9.]*\)")
size1=$(expr "$psnr" : '.*bytes: *\([0-9]*\)')
size2=$(expr "$psnr" : '.*bytes:[ 0-9]*/ *\([0-9]*\)')