ffmpeg batch transcoding of mpeg4

@echo off
SET WORKDIR="D:\ffmpeg\WORLD"
SET OUTPUTDIR="D:\ffmpeg\output"
for %%B in (%WORKDIR%\*) do (ffmpeg -y -i %%B -vcodec mpeg4 -vtag XVID
-threads 2 -acodec libmp3lame -b 4000k -ab 128k %%B.xvid.avi)
for %%B in (%WORKDIR%\*.xvid.avi) do (move %%B %OUTPUTDIR%)