WAV files exported from Audacity are not bit-identical

[DjBR]

Long time, no see.
I've tested again with Audacity 1.3.13
Nothing has been resolved.

Any hopes?

[Gale Andrews]

I've tested again with Audacity 1.3.13
Nothing has been resolved.

That is why it is still listed in the 1.3.13 Release Notes.

Any hopes?

2.0 has not yet been released yet due to:
http://wiki.audacityteam.org/wiki/Relea ... at_Release

As Steve said, this will not be fixed before 2.0. Meantime you can use the workaround listed in the Release Notes.



Gale

[DjBR]

The workaround which mentions that it resolves the problem by setting the High-Quality Conversion dithering to "None" is not working for me.
I just opened a PCM 16/44 and resaved as such, and it's not bit identical.
I'm on Ubuntu 11.04, Audacity 1.3.13

[steve]

I'm using Audacity 1.3.14 on Ubuntu 10.10.

Test method:

• Disable dither in Audacity.
• Import a 16-bit WAV file.
• Export the file with a new name.
• Calculate the MD5 checksum for both files

I've just run this test on 4 different WAV files, and each time the checksum has matched.

[Gale Andrews]

I'm using Audacity 1.3.14 on Ubuntu 10.10.

Test method:

• Disable dither in Audacity.
• Import a 16-bit WAV file.
• Export the file with a new name.
• Calculate the MD5 checksum for both files

I've just run this test on 4 different WAV files, and each time the checksum has matched.

Same matching results in 1.3.14 on WIndows 7, but with SHA-512 checksum and also hex file compare.


Gale

[DjBR]

All dithering disabled.

Foobar2000

Code: Select all

Differences found in 1 out of 1 track pairs.

Comparing:
"H:wav\01 -  example.wav"
"H:wav\01 -  example_02.wav"
Differences found: 2 sample(s), starting at 213.8799774 second(s), peak: 0.0000916 at 213.8799774 second(s), 2ch

Code: Select all

[email protected]:~/wav$ md5sum *.wav
df46d0e74695bb57987f8b2f5fa6b490  01 -  example_02.wav
c19eff9a189550b6018e20d9ce0eea8b  01 -  example.wav
[email protected]:~/wav$ 

I am going to try 1.3.14 in Windows to see how it goes.

UPDATE:

In fact, in 1.3.13, Windows build, I did not get this problem...

Code: Select all

All tracks decoded fine, no differences found.

Comparing:
"C:UsersDjBRMusic\01 -  example_02.wav"
"C:UsersDjBRMusic\01 -  example.wav"
No differences in decoded data found.

So what now? Lacking code on Linux build?

[steve]

So what now? Lacking code on Linux build?

I'm on Linux.

[DjBR]

I'm using Audacity 1.3.14 on Ubuntu 10.10.

So you are using a pre-release then.

The differences I spotted are between Audacity 1.3.13 for Linux and Windows.
Can you try 1.3.13 ?

[Gale Andrews]

I'm using Audacity 1.3.14 on Ubuntu 10.10.

So you are using a pre-release then.

The differences I spotted are between Audacity 1.3.13 for Linux and Windows.
Can you try 1.3.13 ?

That would be pointless. Your 1.3.13 is not our current code, nor (unless you compiled our 1.3.13 source tarball) is it even our code - it's Ubuntu's release. Instead, I suggest you try the latest Audacity Daily Build from Ubuntu which is 1.3.14 with whatever modifications Ubuntu see fit.



Gale

[DjBR]

I have upgraded to Daily Build PPA. I get the same thing.

Code: Select all

[email protected]:~/wav$ md5sum *.wav
df46d0e74695bb57987f8b2f5fa6b490  01 -  Example (Done with 1.3.13).wav
df46d0e74695bb57987f8b2f5fa6b490  01 -  Example (Done with Daily Build AKA 1.3.14-alpha).wav
c19eff9a189550b6018e20d9ce0eea8b  01 -  Example (Original).wav
[email protected]:~/wav$ 

Remaining discussion is about Linux behaviour, so split to http://forum.audacityteam.org/viewtopic ... 18&t=61303