[Audacity-devel] Truncate silence bug replicable

[Gale (A. Team) <ga...@au...>]

>From Release Checklist:

"P3 Truncate Silence may leave tail of unmodified Audio or cut too much
at end. Select the whole track and apply Truncate Silence. Sometimes
effect pastes the shortened audio over the start of the track, leaving
unmodified audio in the tail end. (JC saw originally, but foolishly did
not keep sample file that gave the problem and now can't get it to
happen again).

* GA: I can't reproduce it. Does it paste the original audio before
truncation? I can reproduce truncation of the end of the audio (even if
it was far louder than the threshold), but only intermittently on a few
files. May be subject to parameters and exact nature of silence/length
of audio, but values to reproduce it not obvious. This effect did not
exist in 1.2.6. "

I can now replicate pretty much what James saw after a lot of
experimentation, so am posting here so I can link to this thread on the
Checklist. It seems the area after the "silence" may need to be a
sufficient length for the bug to trigger. I used default settings in
Truncate Silence of 200ms/-20 dB.  

In this image I'm running 1.3.6a6, the lower track is before truncating
silence, and the upper after doing so:    
http://www.gaclrecords.org.uk/cvs.png

While the "silence" between 25 and 40 seconds has been truncated OK, the
audio at the end has been removed, and some of the audio both from 
1:20'' onwards and from before that has been pasted into the middle of the 
result. 

When linking is on, behaviour is a bit different, the audio at the end
being retained:
http://www.gaclrecords.org.uk/cvs_linking_on.png

In either case, the unwanted pasting conspires to keep that particular 
label at 1:20'' in the correct spot, even though the label hasn't moved. 
So I'm wondering if some code added for linking is the cause of this,
even though the pasting also occurs when linking is off?    

1.3.3 gets it right:
http://www.gaclrecords.org.uk/133.png

I have a 13.6 MB project saved which will replicate the above if needed. 
  

Gale 













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