diff -Nrup a/scripts/lav2avi.sh b/scripts/lav2avi.sh
--- a/scripts/lav2avi.sh	2021-09-05 08:14:13.029372896 +0200
+++ b/scripts/lav2avi.sh	2023-05-06 15:22:07.923191133 +0200
@@ -20,7 +20,7 @@ usage=1
 appB=""
 output=${1%.eli}.avi
 
-head "$1" 2> /dev/null | fgrep -q "LAV Edit List" && {
+head "$1" 2> /dev/null | grep -F -q "LAV Edit List" && {
    if [ -f $output ]; then
        echo "ERROR: Remove $output file and restart."
        exit 1
@@ -44,7 +44,7 @@ head "$1" 2> /dev/null | fgrep -q "LAV E
    #
    # Pass 2
    #
-   recomBitrate1=`cat out1.txt | fgrep "Recommended video bitrate for ${preferedSize}MB" | cut -c 41-`
+   recomBitrate1=`cat out1.txt | grep -F "Recommended video bitrate for ${preferedSize}MB" | cut -c 41-`
    if [ -n "$recomBitrate1" ]; then
        appB=":vbitrate=$recomBitrate1"
    fi
@@ -57,7 +57,7 @@ head "$1" 2> /dev/null | fgrep -q "LAV E
    #
    # Pass 3
    #
-   recomBitrate2=`cat out2.txt | fgrep "Recommended video bitrate for ${preferedSize}MB" | cut -c 41-`
+   recomBitrate2=`cat out2.txt | grep -F "Recommended video bitrate for ${preferedSize}MB" | cut -c 41-`
    if [ -n "$recomBitrate2" ]; then
        recomBitrate1=$recomBitrate2
        appB=":vbitrate=$recomBitrate1"