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avformat-55.dll: What Is It & How to Fix its Errors

Expert solutions to get Audacity running in a jiffy!

4 min. read

Updated onOctober 4, 2023

updated onOctober 4, 2023

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Audacity has long been apopular audio editorand is often the first choice of many. And when bundled with the FFmpeg library, you can have a larger set of audio formats to work with. But many users reported getting the missingavformat-55.dllerror.

When aDLL is missing in Windows, applications that rely on it either stop functioning properly or don’t launch altogether. And it’s usually the latter! Besides, there ain’t much users can do because the error message only lists reinstalling the software as a solution. So, let’s find out the others!

Why is avformat-55.dll missing?

Here are a few reasons you are getting the error:

What can I do if avformat-55.dll is missing?

Before moving to the slightly complex solutions, here are a few quick ones to try:

If none work, head to the fixes listed next.

1. Manually add the DLL

For users with access to another PC running Audacity with the FFmped plug installed, a quick solution would be to move to DLL file to the affected computer. Simply copy the file to a USB drive, and paste it on the computer throwing the error.

If you are wondering where to findavformat-55.dll, it should be in the following path:C:\Program Files\FFmpeg For Audacity

And you have to move it to the same path on the affected PC.

2. Download FFmpeg

When you see the failed to loadavformat-55.dllmessage, installing the FFmpeg plugin for Audacity should do the trick. And while doing so, make sure you get the latest version.

3. Check the version of Audacity

Another aspect to verify is that the installed version of Audacity of FFmpeg matches. A user reported the Audacity FFmpegavformat-55.dllissue when running a 32-bit version of Audacity and a 64-bit version of the plugin.

If that’s the case, simply download the 64-bit version of Audacity from theofficial website. Once done, any conflicts between the two should be resolved, and Audacity will locate the missing DLL.

4. Uninstall any version of Audacity

For some users, theavformat-55.dllnot found issue appeared when they had two versions of Audacity installed on different drives, and uninstalling one did the trick. Make sure you get rid of the older version.

5. Reinstall the program

If nothing else worked and Audacity still can’t findavformat-55.dll, the last option is touninstall the program, and then download it all over again.

Also, a few users pointed out that installing FFmpeg before Audacity helped them eliminate the error. So, make sure to try that approach as well.

If you are still facing the issue and looking for alternatives, check our curated list of thebest audio editing software.

For any queries or to share which solution worked for you, drop a comment below.

avformat-55.dll: What Is It & How to Fix its Errors#

Why is avformat-55.dll missing?#

What can I do if avformat-55.dll is missing?#

1. Manually add the DLL#

2. Download FFmpeg#

3. Check the version of Audacity#

4. Uninstall any version of Audacity#

5. Reinstall the program#