diff -ru mjpegtools-1.8.0-orig/scripts/lav2mpeg mjpegtools-1.8.0-fixed-lav2mpeg/scripts/lav2mpeg
--- mjpegtools-1.8.0-orig/scripts/lav2mpeg	2006-11-19 17:11:41.000000000 +0100
+++ mjpegtools-1.8.0-fixed-lav2mpeg/scripts/lav2mpeg	2006-11-19 18:28:32.000000000 +0100
@@ -253,7 +253,7 @@
     esac
 done
 let MOPTIND=OPTIND-LAVRC_COUNT
-shift `expr $MOPTIND-1`
+shift $((MOPTIND-1))
 
 if [ "${QUIETLOG}" != "" ]; then
    logfile=${QUIETLOG}
@@ -267,7 +267,8 @@
 
 # lavinfo should set up video_frames, video_width
 # video_height, video_inter, video_norm, audio_chans
-eval $($LAVINFO $@ | grep "=")  # grep for = to remove Warnings
+# Add backslashes to protect contained spaces
+eval $($LAVINFO $@ | grep "=" | sed -e 's: :\\ :g')  # grep for = to remove Warnings
 if [ "$video_frames" == "" ]; then
    logIt "'lavinfo $@' died! exiting"
    logIt " maybe you don't have lavinfo. or your input flags were wrong"
@@ -401,7 +402,7 @@
    fi
 fi
 
-if [ $video_inter -eq 1 ]; then
+if [[ ${video_inter/interlacing/} != ${video_inter} ]]; then
    yuvdenoise_flags="$yuvdenoise_flags -F"
 fi