China DOS Union

How to change a double extension into a single one?? For example, change *.avi.rmvb to *.flv

You posted this twice

@echo off & setlocal enabledelayedexpansion
for /f "tokens=* " %%i in ('dir /b ^| findstr /i "avi.rmvb"') do (
set filename=%%i
set filename=!filename: =_-!
for /f "tokens=1,2,3 delims=. " %%i in ("!filename!") do set filename=%

%i.flv
set filename=!filename:_-= !
ren "%%i" "!filename!"
)
pause

Heh, I'm still not an expert, and the code I wrote is too long... don't mind it.

Everything the poster above said is wrong. In another thread, the OP was asking how to convert *.rmvb video format to *.flv format.

@echo off for %%i in (*.avi.rmvb) do call :Print "%%~ni" pause goto :Eof :Print echo %~n1.flv goto :Eof
I haven't written batch files for a long time, so it feels much less familiar now.
If the printed result is correct after running it, you can try passing %%i to :Print as %2, and then change echo to ren

The poster above, look at reply #5

And then look at this thread
http://www.cn-dos.net/forum/viewthread.php?tid=29891

Why be so fixated on it?
It's mainly just discussing the approach.
Besides, it's nothing more than replacing ren/echo with commands like mencoder.exe -ffourcc FLV1 -of lavf -lavfopts ……