Audacity Bug Summary
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    Audacity 3.0.3 development began 19th April 2021

Audacity Bugzilla



Bug 21 - 16-bit WAV/AIFF imported as noise into 24-bit projects when Preferences were set to copy in the data
16-bit WAV/AIFF imported as noise into 24-bit projects when Preferences were ...
Status: RESOLVED FIXED
Product: Audacity
Classification: Unclassified
Component: Formats
1.3.9
Per OS All
: P3 MoonPhase
Assigned To: Default Assignee for New Bugs
:
Depends on:
Blocks:
  Show dependency treegraph
 
Reported: 2009-10-30 14:54 UTC by Richard Ash
Modified: 2018-08-20 11:54 UTC (History)
1 user (show)

See Also:
Steps To Reproduce:
Release Note:
AIFF files exported by Audacity from recorded or generated data import intermittently (but at times very frequently) as noise - files play fine in other software.
First Git SHA:
Group: ---
Workaround:
Closed: 2018-08-20 00:00:00
richard: Regression+


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Description Richard Ash 2009-10-30 14:54:03 UTC
* GA: Much of the time, 1.3.7 or later on Windows cannot be relied on to import
files exported with the explicit "AIFF (Apple) signed 16 bit PCM" filter.
Appears to affect exports from recorded data (at any Defauit Sample Rate), or
from tones generated at 24-bit. Same problem occurs with the AIFF 24-bit option
accessed with "Options" button, but not apparently the comparable 16-bit
option. Export Multiple seems affected the same way as regular export. Tested
at 44100 Hz, reading directly. On Mac, a user 22 March 09 reports 1.3.7
"suddenly" producing noise when importing AIFF files where it did not before in
many similar imports - user changed default sample format to 24-bit at about
the same time. More details here.
* LL: Gale, have you been able to find a pattern to recreate this? I've tried
numerous variations on OSX and Windows and it always seems to import ok.
* GA: Are you using a release build? In ANSI Release from HEAD, I created a
chirp tone in 24-bit quality, recorded it using stereo mix then exported only
the recorded track using the explicit (no options available) AIFF (Apple)
signed 16-bit PCM choice. I changed Quality to 32-bit, closed the tracks and
repeated the generation, record and export. I am not getting noise on importing
the files back into Audacity but what I can replicate is that about half the
time the files will crash both HEAD and 1.3.7 Unicode Release; if they don't
crash they import properly. So behaviour compared to when I last tested is not
the same. I have tried importing with the "All supported files" and
"FFmpeg-compatible files" filter and the problem is identical. In 1.2.6 I can
import these files dozens of times without problem.
Comment 1 Richard Ash 2009-10-31 18:01:43 UTC
I think 24-bit mode is likely to be implicated in this - I'm willing to be proved wrong, but I'd like a report that definitely had Audacity in 32-bit internal data mode (or 16-bit, if we know that). In this case it wouldn't be a regression, because 24-bit mode has been at least partly broken since the dawn of time, largely because no-one involved in development uses it.
Comment 2 James Crook 2010-01-29 13:36:37 UTC
Not in wiki as of 29-Jan-2010
Comment 3 Gale Andrews 2010-02-08 06:30:19 UTC
* GA: Michael fixed a specific problem November09 where 16-bit WAV/AIFF imported as noise into 24-bit projects when Preferences were set to copy in the data. However that wasn't 100% replicable for me on Windows (before that fix, 16-bit WAVs from a CD ripper would sometimes import OK into "copy in" 24-bit projects). Now moved to http://bugzilla.audacityteam.org/show_bug.cgi?id=35 where for a few users, AIFF and WAV crash regularly on import, using (they say) initialised preferences.