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How to Deal with Audible MP4 Files and Convert Audible MP4 to MP3

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I have a program to convert Audible AAX files. But recently when I tried to download an audiobook from Audible site, it only downloads as an MP4 file. It's "encoded in a format that isn't supported" that none of the programs on my computer can open. I have been downloading AAX files for years, but now I couldn't. Does anyone else get this problem? Is there a way to force .aax downloads?

Since 2021/10/05, there have been a few reports that files downloaded directly from the Audible site are labeled as MP4 format instead of the normal AAX. After talking to a few users and doing tests, we've found the reason and the solution as well. Let't get started to learn how to deal with the Audible MP4 files.

how to deal with audible mp4 files

Part 1. When Will Audible Download MP4 Files?

According to the existing reports, the MP4 issue is only appearing when Audible books are downloaded from the latest version of Firefox browser V93.0, which is released on October 5, 2021. It happens on both Windows and Mac computers. So in a word, this is an issue with the latest version of Firefox - V93.0.

Firefox version

When you are trying to download an Audible book from the Audible site via Firefox V93.0, you will see a pop-up window showing you that's an MP4 file. Just select "Save File" to download the Audible MP4 file to your computer.

audible MP4 file

Part 2. How to Deal with Audible MP4 Files and Convert Audible MP4 to MP3?

As for now, all the Audible Converters available only support converting Audible AAX or AA format to MP3. None of them can convert Audible MP4 format. Therefore, in order to convert Audible MP4 to MP3, we must change Audible MP4 to AAX format and then convert AAX to MP3. The following are two methods of deal with the current Audible MP4 files.

Method 1. Change the Audible file extension from MP4 to AAX.

Actually, although Firefox browser is incorrectly downloading the Audible files as .MP4, they are really AAX files in disguise. Nothing is changed in the structure. So by simply changing the file extension from MP4 to AAX could solve the problem. Let's see how to replace the MP4 file type with AAX.

Step 1 Find your downloaded Audible MP4 file on your computer. (Troubleshooting: Cannot see the Audible .mp4 file extension.)

Step 2 Right-click the Audible MP4 file and click "Rename". Then click and drag over the extension, change the .mp4 extension to .aax. This is working for both Windows and Mac.

change audible mp4 to aax

If you are asked whether you are sure to change the extension, just click "Yes".

yes

Step 3 Convert Audible AAX files (changed from MP4 files) to MP3 with Epubor Audible Converter.

Download and install Epubor Audible Converter to your computer. Launch it. And add your Audible .aax files by simply dragging them to the main interface. Next click the blue button "Convert to MP3". The conversion will be finished in few minutes. After that, you will get your Audible files in MP3 format.

Download Epubor Audible Converter for Free
   

convert audible mp4 to mp3

Troubleshooting: Cannot see the Audible .mp4 file extension

Notice: Some users may not see the .mp4 file extension just like the following picture, because it's hidden. In such a case, we need to unhide the extension in order to change the file suffix .mp4 to .aax.

no file extension

1For Windows: Start the File Explorer. Click the "View" tab on the ribbon. Check the box next to "File name extensions". Check the box next to "File name Extensions"

show file extension windows

2For Mac: In the "Finder" on your Mac, choose Finder >> Preferences, then click Advanced. Check "Show all filename extensions.”

show hide filename extensions mac.png


Method 2. Change to a non-Firefox browser to download Audible books.

As the Audible MP4 files now only appear in the Firefox, another easy and feasible way is to change to a different browser and redownload Audible books. Google Chrome and many other browsers are all downloading Audible files in AAX format.

author

loves reading very much. She seeks the methods to enjoy eBooks and audiobooks more freely and wants to share everything new she has got with you.

13 Comments
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10/26/2021 01:32:39
Had exactly the same problem, changing the file extension didn't work, but using Microsoft Edge did work. Thanks for the update firefox that screwed everything up in the 1st place.
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11/5/2021 06:45:42
Not sure what you were doing wrong, but I'm sure it was something.You're the first person I've seen claiming renaming the extension did not work. There's no reason it should not work, because it IS in fact only an aax file being renamed by FF with the wrong extension. Nothing is actually being changed with the file codec, though.
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11/19/2021 08:54:40
I had the same problem and it does work with the instructions given but I figure since it is because of firefox, why not try to download my audible books in internet explorer. It works. The audible books comes up with the aax extension. So the easy way is just download your audibles from the internet explorer. Then you just use the AAX converter like you are use to doing. I hope this helps.
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10/27/2021 19:32:02
Thank you!!!!!
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10/30/2021 10:55:36

I just hit this.  Tried the converter.  It pretty much just 'hangs'.  Also locks (assume it is the culprit) the Windows Explorer session used to drag/drop the .mp4.

As '... it only works with .aax ...' files, seems that it at least trying to do 'something'.  Would be preferable to give a message '... invalid file type ...' for such files (i.e. any file that isn't .aax file type) or some such rather than hanging up, no?

thx, lo

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10/30/2021 23:12:05

I ran into this yesterday.  I ended up installing the desktop Audible app and it still downloads the .aax files.  

Good to have lots of work arounds but an error message like Lo suggested would be nice instead of the hard lock.

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10/30/2021 23:30:22
In Italia non è più possibile "scaricare" i files.
Si possono solo "ascoltare" da un browser e dal sito di Audible in Libreria.
Mi spiegate dove trovate i file scelti che non sono presenti nel mio PC o iMac?
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11/2/2021 10:01:34

Thank you for asking. Do you purchase the audible plus service? If yes, then you are not able to download this kind of audible books. It is forbidden by Audible.com. To download audible books, you need to purchase the audible books by credit or money, then you can download it to your computer.

Have a nice day.

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10/31/2021 07:49:16
renaming worked perfectly! thank you
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11/1/2021 21:39:40
I use Firefox as default browser and I'm a heavy Audible user. This problem began with my first Audible download after updating Firefox in mid-October. Following your advice, I renamed the file, clicked, iTunes opened on my MacBook Pro and the book began. Thank you for taking the time to sort this out.
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11/2/2021 09:28:31
Thank you for your feedback. We are glad to know that your issue has been fixed. Have a nice day!
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11/19/2021 08:58:59
I had the same problem and it does work with the instructions given but I figure since it is because of firefox, why not try to download my audible books in internet explorer. It works. The audible books comes up with the aax extension. So the easy way is just download your audibles from the internet explorer. Then you just use the AAX converter like you are use to doing. I hope this helps.
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11/29/2021 04:05:30
I got a new iphone and suddenly I couldn't do what I had done a thousand times, download a book into iTunes and listen to it on my phone.  Blaming the phone.  But then I did notice that I had downloaded a mp4 file instead of the usual format.  For me, the fix was using Safari instead of my ole buddy Firefox and things worked just like they are supposed to.  THANK YOU!
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