How to convert audio in each directory by FFmpeg and batch script.

Question

After a hard study, I have created a batch file:

for /R  D:\storytelling\MusicFiles %%a in (*.3gp) do ffmpeg -i %%a -y %%~na.mp3

However, it can't reach my goal since the scenario is a little different here:

Here is my directory structure: enter image description here

I have several directories under a certain path:D:\storytelling\MusicFiles\ and new directories could be created by another application. And I put ffmpeg.exe file in this path: D:\storytelling\MusicFiles\.
Also, In each directory, I have hundreds of .3gp files, and my target is to convert them to .mp3 in the directory where they used to stay at.
But this script

for /R  D:\storytelling\MusicFiles %%a in (*.3gp) do ffmpeg -i %%a -y %%~na.mp3

would convert every .3gp file in each directory to the path: D:\storytelling\MusicFiles\

It leads to: enter image description here
But I want the publicUser_XXX.mp3 files are still in the directory publicUser and after conversion all the files remain in their original directory. The only change is that I got new a media copy with different media format like:

Please help and give me some advise.

foxidrive · Accepted Answer · 2013-06-16 12:12:45Z

2

Try this:

@echo off
for /R  D:\storytelling\MusicFiles %%a in (*.3gp) do ffmpeg -i "%%a" -y "%%~dpna.mp3"

answered Jun 16, 2013 at 12:12

foxidrive

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8 Comments

Alston Over a year ago

Great, it works!. May I ask you why don't you add quotation mark to like: "(*.3gpp)" and why did you add that to %%~dpna.mp3, what's the timing? And... What does %%~dpna actually do?

Alston Over a year ago

Btw: Stackoverflow already provides a button to let you upload the image.

foxidrive Over a year ago

@Stallman - thanks for replying - I found the upload button.

foxidrive Over a year ago

It's always good practice to use "path\filename" because then you don't have to redesign the code later for long filenames. (*.3gp) part of a for-in-do command will never need quotes. There are many cases in batch files where exemptions-to-the-rule apply and learning them slowly as you need them is a good way. In general always double quote "c:\folder\filename.ext"

foxidrive Over a year ago

%%~n is the part that applies the name part of the metavariable and the a is the suffix because you used %%a. If you used %%B then it would be %%~nB (case sensitive). See the for /? help on the last page for a list.

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