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