Trying to combine .au from temp

Hey there,

I am trying to rescue a podcast recording that was mistakenly recorded while Audacity was still in the .dmg when it crashed. I don’t have a .aup but I did find all of the corresponding .au files from the temp folder.

I’ve gone through the process of copying and then renaming the file sequentially (as suggested here: but when I run them through the Audacity Recovery Utility ( I get this error about 40 files into the process (see attachment).

Any idea what I should troubleshoot?


What version of Audacity are you using and what version of OS X? See the pink panel at the top of this page.

If you are on an Intel Mac you need the Intel version of the 1.2 Recovery utility.

In practice you can’t feed the 1.2 utility more than 1 GB of data, so no more than four “d” folders.

What happened when you restarted Audacity? 2.0.x Audacity should offer to recover the recording from the AUTOSAVE file. See .


Thanks for the quick response Gale! And my apologies for neglecting the banner message.

OSX: 10.9.4
Audacity: 2.0.5
Audacity Recovery Utility: 1.1

On reboot, it offered to recover the project but gave an error that I didn’t write down nor can I reproduce (it’s not offering to recover when I launch now).

Also, there are 6 “d” folders. Is there a way to split them up (have 3 in one bin and 3 in another) and combine them separately then stitch them together post?


After you got the error, did you close Audacity and respond to the “Save Changes?” question? If you answered “Yes” then the data is saved with whatever errors are there. If you answered “No” the data is discarded.

So, did you copy the audio data in the Temp folder before closing Audacity? if you drag a few of the AU files into Audacity, are they silence or part of the recording?

If the recovery is wrong and you can’t work out from Help > Show Log… what the problem is, you should force quit Audacity - that way, the AUTOSAVE file that manages the recovery and the data are preserved. If the error was only one orphan block file and the recording looks OK, it’s best to use what’s recovered.

Just make two new folders and copy three “d” folders to one folder and the other three “d” folders to the other folder.

Recover the AU files from one new folder to a recovery WAV file (or two recovery WAV’s if it was a stereo recording) then do the same for the second new folder. Then you can just join the WAV files end-to-end in Audacity.


Yes, I did.

They have a waveform, split out since they were recorded in stereo.

I did split out the directories but I’m still getting the same error from the Recovery Utility.

Suppose you recover from one “d” folder at a time. Do all those folders fail after processing about 40 files?

There is an alternative python script that attempts to create an AUP file from the data (again assuming the AU files are named sequentially in timestamp order). But you would have to use the Mac terminal to use that script.