Re: [Audacity-quality] [Audacity-devel] Stereo AIF files import as silence when using FFmpeg importer

[Bill W. <bi...@go...>]

On 26/06/2012, at 3:14 PM, Gale Andrews wrote:

> 
> | From Bill Wharrie <bi...@go...> 
> | Tue, 26 Jun 2012 12:34:50 -0400
> | Subject: [Audacity-quality] Stereo AIF files import as silence when using FFmpeg importer
>> I came across this while testing OD-import using FFmpeg (which seems to work fine).
>> 
>> I don't think this is a release blocker for 2.0.1. Possibly P3 (if it is not already in Bugzilla - I couldn't find it)
>> as there is a simple workaround - don't use FFmpeg to import stereo AIF files.
> 
> Not in bugzilla - not known of before now.   
> 
> 
>> Cross-posting to -devel as it is up to RM to decide the severity of this bug.
> 
> Does 2.0.0 release exhibit the behaviour you note with silenced import?
> If not, it would tend to increase the severity towards release blocker: 
> 
> "Never less good overall than the standard set by 2.0.0 - only trivial 
> regressions are likely to be tolerated in a release."   

1.3.14 (at least) is the same on Mac. So I'd say not a release blocker, maximum P3.

> 
> 
>> Audacity 2.0.1. Mac OSX 10.7.2. Clean install (no audacity.cfg file, no 1.2.x prefs existing on the system). FFmpeg files in standard location and found on startup.
>> 
>> Start Audacity.
>> File > Import > Audio; choose "FFmpeg-compatible files" then choose a WAV or AIF file
>> - the file imports with libsndfile complete with the "uncompressed file warning" dialog.

Same on 1.3.14.

> 
> Testing on Win 7 x64. 
> 
> 2.0.0 and 1.3.14 do that too with stereo WAV or AIFF, from no or
> initialised .cfg with no 1.2 settings present, so at least that part is
> not a regression on 2.0.0. Looks like a separate P3, on its own?  

Yes, not a regression and a separate P3 or P4 on its own. As soon as there is a .cfg file this problem goes away, so certainly an edge case.

> 
> 
>> Delete track
> 
> I assume you mean using [X] on Track Control Panel, which I 
> did. 

Yes, that's what I meant.

> 
> 
>> Preferences > OK
>> - note that audacity.cfg is created at this point.
> 
> Agreed.

In 1.3.14 on Mac, audacity.cfg is not created at this point. Need to quit Audacity for audacity.cfg to be created.
> 
> 
>> File > Import > Audio; choose "FFmpeg-compatible files" then choose a stereo AIF file
>> - the file imports as silence
> 
> Stereo AIFF and WAV imports properly with libav here.

In 1.3.14 on Mac, after quit and restart (thus creating audacity.cfg), importing a stereo AIF with "FFmpeg-compatible files" imports as silence.

So this part would appear to be a Mac only problem (at least until we hear from Linux testers).

My FFmpeg version numbers are F(52.64.2),C(52.72.2),U(50.15.1)

-- Bill

> 
> 
> 
> 
> Gale 
> 
> 
> 
>> Log says:
>> 11:45:00: File name is /path/to/file.aiff
>> 11:45:00: Mime type is *
>> 11:45:00: Opening with libav
>> 11:45:00: Open(/path/to/file.aiff) succeeded
>> Delete track
>> File > Import > Audio; choose "FFmpeg-compatible files" then choose a MONO AIF file
>> - file imports successfully
>> Delete Track
>> File > Import > Audio; choose "FFmpeg-compatible files" then choose a stereo WAV file
>> - file imports successfully
>> Delete track
>> Preferences > Libraries; check "Allow background on-demand loading"; OK
>> File > Import > Audio; choose "FFmpeg-compatible files" then choose a stereo AIF file
>> - the file imports as noise
>> Delete track
>> File > Import > Audio; choose "FFmpeg-compatible files" then choose a MONO AIF file
>> - file imports successfully
> 
> 
> 
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