As mentioned in my earlier post, ffmpeg is the best tool to convert media files. However sometimes you need to convert a collection files in one go. Of course you can use various gui tools for ffmpeg, but I like to keep things simple (or complicated, depending on the context).
Basically ffmpeg can only process 1 file at a time from the command line. Linux/Mac users have powerful bash script at their disposal, but do not underestimate Windows
You probably already have a batch file to convert a single file (which contains all the required parameters for ffmpeg). What we need to do is add an additional batch file which will call “converting” batch file.
So, say you want to convert all .mov files in a folder to .mp3. Let’s start by our converting batch file.
IF EXIST "%1.mp3" GOTO exit
@echo Conversion for %1 started on %DATE% %TIME%
ffmpeg -b 128k -i %1 %1.mp3
@echo %1.mp3 already exists
What does it do: Checks if output exists, if not then converts the input file to .mp3 using ffmpeg.
Next step is to create the batch file which will call the above batch file.
for %%i IN (*.mov) DO (convert-to-mp3.bat "%%i")
As you can see this is a simple for loop calling your converting batch file.
To just convert all the .mov files to mp3, start startconvert.bat and you will be fine.