#!/bin/bash

shopt -s extglob

for f in !(*.mpg);
  do echo "start processing \"$f\" at \"$(date)\"" > log.txt ;
done
  do avconv -i "$f" -r 24 "${f%.*}.mpg" &&
 rm "$f" &&
done
for f in *.mpg;
 do mkdir "${f%.mpg}" &&
  mv "$f" "${f%.mpg}";
done

echo "ended at \"$(date)\"" > log.txt;
done