Difference between revisions of "Recovering crashes manually"

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== How to recover unsaved data ==
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[http://www.backtothebible.org/help/files/dofrvc.html Polizza salute] [http://www.startonlineweb.com/help/new/livcvh.html Loghi tim] == How to recover unsaved data ==
  
 
If Audacity is not able to shut down properly (e.g. because the program crashes, or the computer loses power suddenly), then unsaved data may be left in Audacity's temporary files folder.  These instructions can help you recover that unsaved data.
 
If Audacity is not able to shut down properly (e.g. because the program crashes, or the computer loses power suddenly), then unsaved data may be left in Audacity's temporary files folder.  These instructions can help you recover that unsaved data.
Line 97: Line 97:
 
files = []          # only interested in .au files and
 
files = []          # only interested in .au files and
 
for i in rawfiles:  # prepend each with the directory name
 
for i in rawfiles:  # prepend each with the directory name
   if i[-3:] == '.au': files.append(directory+'/'+i)
+
   if i[-3:] == '.au': files.append(directory '/' i)
  
 
files.sort()  # sort files so the result will be in proper sequence
 
files.sort()  # sort files so the result will be in proper sequence
Line 144: Line 144:
 
files = []          # only interested in .au files and
 
files = []          # only interested in .au files and
 
for i in rawfiles:  # prepend each with the directory name
 
for i in rawfiles:  # prepend each with the directory name
   if i[-3:] == '.au': files.append(directory+'/'+i)
+
   if i[-3:] == '.au': files.append(directory '/' i)
  
 
files.sort()  # sort files so the result will be in proper sequence
 
files.sort()  # sort files so the result will be in proper sequence
Line 163: Line 163:
 
fpp.write(dd)
 
fpp.write(dd)
  
#it's stereo, so the .au files should alternate left & right channels, so files
+
#it's stereo, so the .au files should alternate left
#should be written to our two recovery files alternately starting with the 3rd file in our list
 
 
 
#count serves as a quick hack to let us alternate recovery files
 
count = 1
 
#this is just to give a quick count so you can see if the two recovery files got the same number of files added to them
 
track_one_files = 1
 
track_two_files = 1
 
# for every other file, write from the data offset on
 
for i in files[2:]:
 
  if count == 1:
 
#write to first recovery file
 
  dd = open(i, 'rb').read()[12380:]
 
  fp.write(dd)
 
  count = 0
 
track_one_files = track_one_files + 1
 
  else:
 
#write to second recovery file
 
dd = open(i, 'rb').read()[12380:]
 
  fpp.write(dd)
 
count = 1
 
track_two_files = track_two_files + 1
 
 
 
print "Files recovered for track 1:"
 
print track_one_files
 
print "Files recovered for track 2:"
 
print track_two_files
 
# close recovered sound files
 
fp.close()
 
fpp.close()
 
</pre>
 
----
 
I was unable to get sox to work as the above tip instructed.  Sox always complained about a missing operation or misinterpreted the filename of one of the Audacity temp files as a filter to perform on the other files.
 
 
 
So, I used sox in a different way.  I was trying to rescue an hour-long mono recording on a Unix-like system (a Fedora Core 3 GNU/Linux system).  First, I made a copy of the temp directory and its files:
 
 
 
<pre>
 
$ cp -r /tmp/audacity1.2-jbn ~/rescue
 
</pre>
 
 
 
Then I used sox to convert the AU temp files into raw files (headerless files).  Since Audacity had already numbered the files with leading zeroes (and perhaps because I didn't have that many of them to work on), I could use an ordinary shell wildcard to do the work:
 
 
 
<pre>
 
$ for f in b*.au ; do sox ${f} -t raw ${f}.raw ; done
 
</pre>
 
 
 
I concatenated the raw files together to make one hour-long mono raw file.  I had to use raw files to do this, concatenating the AU files together (each with its own header) would have produced a periodic noise (because Audacity was trying to interpret the AU header data as sound data).
 
 
 
<pre>
 
$ cat *.raw > bigfile.raw
 
</pre>
 
 
 
And then I imported the raw file into Audacity specifying the appropriate number and signedness of the samples (16-bit signed PCM, in my case), endianness (Big-endian, in my case), channels (1 channel for mono), and sample rate (44,100 samples per second, in my case).  I wanted to import the whole file (100%) starting from the beginning (0 byte offset).
 
 
 
I was left with a file I could export to WAV, play, and edit normally.
 
1
 
 
 
------
 
 
 
I recently have to kill audacity and as a result I lost the aup project file for my recording of 3000+ au files. What exactly should I do to restore the aup project file from the thousands au files?
 
 
 
------
 
i tried to add the .au files to a winamp playlist ordered by date (ascending)
 
then save the output as a wav file
 
this solved my problem. i hope it will help yours.
 
(My project was a recording project so the order of files were easily understood)
 
 
 
------
 
I also had success with the winamp method using the write to disk output utility.  Didn't work for me until I first converted each individual .au into .wav files then converted all the .wav files into a single .wav file.
 

Revision as of 06:22, 26 September 2007

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If Audacity is not able to shut down properly (e.g. because the program crashes, or the computer loses power suddenly), then unsaved data may be left in Audacity's temporary files folder. These instructions can help you recover that unsaved data.

Note: This can be very difficult for long recordings. The Audacity developers are planning to add auto-recovery features to future versions of Audacity.

When you first launch Audacity after a crash, a dialog will appear warning you that there are still files in the temporary folder. It will ask if you want to delete the files. Say "no." (If you were editing an existing project, then the files may be in the project_data folder instead of the temp folder.)

Audacity breaks tracks into "block files", each with about one megabyte of data. This allows Audacity to perform many editing tasks very quickly and efficiently. Without a saved project file, Audacity does not know how to assemble the blockfiles into tracks. You will need to assemble them manually.

NOTE: As of 20060409, none of the information here works for Audacity 1.3x. For one thing, the temporary files are not numbered decimal sequentially. If the files are sorted by the date they were created, and then renamed in that order as if they came from 1.2.x, then they should recover OK. The next release of audacity will automate this process.

Instructions

Check the "Directories" section of the Audacity preferences to find out where temporary files are stored.

Mac users: The temporary folder is usually hidden in the Finder. To access it, use the "Go To Folder" command in the Finder, or type "open /tmp/INSERT_FOLDER_NAME_HERE" in the Terminal. If that doesn't work, try to make the Finder show its hidden files and folders by entering this as a command in the terminal:

defaults write com.apple.finder AppleShowAllFiles -bool true

or try TinkerTool  to do the same thing.

Once you have located Audacity's temporary folder, use the "Import Audio" command in the Project to open all of the .au files in Audacity's temp folder. Use shift-click or control-click to select multiple files. The files will be in approximately 10-second chunks. Files from stereo tracks will alternate between left and right channels. You can use copy/paste to re-assemble the original tracks.


Audacity Recovery Utility

The following program was written by an Audacity developer to help with crash recovery. It still needs more testing, so please write to [email protected] to let us know whether it works for you:

Aud_Recover command-line recovery utility

This is a portable command line program by Tyler Knott which does much the same as the Audacity Recovery Utility but is not written in python/ wxpython, so does not need those libraries in order to compile it. Due to limitations in the C standard library this program cannot create files larger than 2 GB.

You can download aud_recover version 1.1.1 here. This download contains binaries for Windows (32-bit) and the cross-platform C source code.

To recover files using this program:

  1. Find the first and last files in the recording by listening to them (if you've only done one recording then that should be the first and the last files in the directory).
  2. Place the aud_recover program in your Audacity temp directory
  3. aud_recover requires several settings to run. You can either enter them as command-line options (use --help for more infmormation) or interactively by simply running the program.
  4. aud_recover will generate one or more files (depending on how many channels of audio you recorded, usually one or two for mono and stereo). You need to import these into Audacity using the Import Raw Data option. To configure the dialog, follow these directions:
    • You can determine the sample format (the first drop-down) and the endianness (the second) using the included auinfo utility.
    • The header offset should be zero and the amount to import should be 100%. No matter how many channels were recorded you should keep it set to 1 (see the next numbered step).
    • The sample rate should be set to the sample rate you recorded at (the sample rate given by auinfo is always 44100, even if that is incorrect, due to a bug in Audacity).
    • Repeat this step for every output file.
  5. For stereo files set the left channel to left, the right channel to right, then select "Make Stereo Track" from the track popdown menu to convert it to a stereo track.

The resulting track should be exactly what was recorded before Audacity crashed.

If you have any questions, comments, or bug reports please don't hesitate to e-mail me at tknott *at* gmail *dot* com

Other Tools

This freeware tool can automatically join large numbers of files. (Note: One Audacity user reported an audible noise at the places where the files were joined.)

  • tail and cat (On Linux/UNIX systems)
   - I found that 123 AV Merger gave me exactly what I would get with cat.
   I  was able to get around this with the following procedure:
   1. I had to throw out all odd-numbered files (1,3,5...)
   2. Using tail's byte-count switch "-c" I copied each remaining .au to a new .au.tmp file
   3. Using cat I  ran all the .au.tmp files into on long .au
   4. Imported the final .au with "Import RAW Data"
   5. Exported the track as wav
   I played around with exactly how many bytes to tail until there was no longer any sharp noises at each joint. I don't have that number with me right now - I'll try to get it later.

This could be theoretically written into a script. I'll try to add more details later.


<a href="http://sox.sourceforge.net/">sox</a> can concatenate the files together.

Usage: sox file1 .. filen outfile

(Sox can handle up to 32 files at a time.)

e.g. for a mono recording:

  % sox b0000*.au b0001*.au b0002*.au junk0.au

After I'm done, I have just several au files to import (a lot fewer than before).


I found it easier to write the following Python script that I used under Mac OS X to recover 1.2GB of data. It was easier than the above solutions.

% cat recover.py

# python script to recover audacity recording after crash

import os

directory = raw_input('Enter directory where temp data files are: ')

rawfiles = os.listdir(directory)  # grab directory listing

files = []           # only interested in .au files and
for i in rawfiles:   # prepend each with the directory name
   if i[-3:] == '.au': files.append(directory '/' i)

files.sort()  # sort files so the result will be in proper sequence

# open the output file for the recovery
fp = open('recover.au','wb')

# write the whole first file because it has the header
dd = open(files[0],'rb').read()
fp.write(dd)

# for every other file, write from the data offset on
for i in files[1:]:
   dd = open(i, 'rb').read()[12380:]
   fp.write(dd)

# close recovered sound file
fp.close()

I had problems using the above script. I found that it didn't really write every other file, so if you try to recovery stereo recordings you get a nasty echo effect since every other file is the left or right channel.

The problem with the script above is that you coded the slice wrong:

>>> x=(1,2,3,4,5,6,7,8,9,10)  # sample data
>>> x[1:]                     # doesn't do what you wanted
(2, 3, 4, 5, 6, 7, 8, 9, 10)
>>> x[::2]                    # this gets the odd-numbered items
(1, 3, 5, 7, 9)
>>> x[1::2]                   # this gets the even-numbered ones
(2, 4, 6, 8, 10)

So, you just need to change the line "for i in files[1:]:" to either "for i in files[::2]:" (for the first channel), or "for i in files[1::2]:" (for the other).

I wrote this modified version of the script to try to put the two tracks into two recovery files. Unfortunately, just importing the recovered files doesn't seem to give you perfect stereo again because of sync issues, possibly due to missing files in the recovery set. Give it a shot, it might work for you.

# python script to recover audacity recording after crash

import os

directory = raw_input('Enter directory where temp data files are: ')

rawfiles = os.listdir(directory)  # grab directory listing

files = []           # only interested in .au files and
for i in rawfiles:   # prepend each with the directory name
   if i[-3:] == '.au': files.append(directory '/' i)

files.sort()  # sort files so the result will be in proper sequence

# open the output file for the recovery
fp = open('recover.au','wb')

# write the whole first file because it has the header
dd = open(files[0],'rb').read()
fp.write(dd)

#this is intented for recoverying stereo and the second file should be the
# first part of the second track, so write the whole file.

fpp = open('recover2.au','wb')
# write the whole second file because it has the header for track 2
dd = open(files[1],'rb').read()
fpp.write(dd)

#it's stereo, so the .au files should alternate left