-benchmark -vf framestep=I,scale="$width":-2 -ss "$(($cnt*$chunk))" "$video" >/dev/null 2>/dev/null
mv "$tmp/00000001.jpg" "${tmp}/_${cnt}.jpg"
done
-benchmark -vf framestep=I,scale="$width":-2 -ss "$(($cnt*$chunk))" "$video" >/dev/null 2>/dev/null
mv "$tmp/00000001.jpg" "${tmp}/_${cnt}.jpg"
done