#!/bin/sh

DIR="." #working directory

FROM_EXT="rmvb" #convert from
TO_EXT="avi"  #to avi format

VCODEC="mpeg4"
ACODEC="pcm"

for i in $DIR/*.$FROM_EXT; do
	OUT_FILE="`echo "$i" | sed s/.$FROM_EXT/.$TO_EXT/`";

	#konverting the video
	mencoder -ovc lavc -lavcopts vcodec=$VCODEC -oac $ACODEC "$i" -o "$OUT_FILE";

	#removing original file
	rm -f "$i";
done