# User-defined Tools

**URL:** https://community.mp3tag.de/t/user-defined-tools/966
**Category:** FAQ (Frequently Asked Questions)
**Created:** [April 16, 2004, 6:56am UTC](https://community.mp3tag.de/t/user-defined-tools/966 "2004-04-16T06:56:38Z")
**Posts on this page:** 1
**Showing post:** 7

<div class="post-metadata">

### Author: ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [February 6, 2022, 7:55am UTC](https://community.mp3tag.de/t/user-defined-tools/966/7 "2022-02-06T07:55:14Z")

</div>

### Example — Re-encode WAV using `ffmpeg`

Some WAV files [have an invalid structure](https://community.mp3tag.de/t/how-to-check-files-for-errors/44633) or extra junk bytes at some RIFF chunks so re-encoding the file might fix the problems.

You can use the excellent [ffmpeg](http://ffmpeg.org/download.html#build-windows) command line utility as a user-defined tool from within Mp3tag.

 ![Convert using ffmpeg as a user-defined tool](https://community.mp3tag.de/uploads/default/original/2X/3/3679a90c3551cfba7637bad0afac1901801a0905.png)

**Name**  
wav2wav

**Path**  
Please locate the path of your `ffmpeg.exe`

**Parameter**  
`-i "%_filename_ext%" "%_folderpath%\%_filename%_out.wav"`

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_[View the full topic](https://community.mp3tag.de/t/user-defined-tools/966)._