Re: [Audacity-devel] Truncate silence bug replicable

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

Martyn Shaw-2 wrote:
>> Gale (Audacity Team) wrote:
>> 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. 
>
> This part of the analysis is not correct.  The section of the original 
> from about 37s to about 1m27s has been copied and pasted to start at 
> about 25s, finishing at about 1m15s.  The bit from 1m15s is the 
> original, unmoved audio.  The 12s missing off the end is the result of 
> the length being truncated (I believe).  So its just the bit after 
> 1m27s of the original that isn't getting moved to the left...

Yes true here with my test project as well, I should have used chirp tone
like you for those parts. I retried by doubling the length of music from 37s
to 1:05'' in the original track, and then did not get any of the following
tone copied and pasted, only some of the music. Would you agree length of
track does seem to be something to do with it? If I reduce the length of the
original audio to 20 seconds by reducing the length of all the components in
proportion, then regenerating the chirps for the tone sections, there is no
problem. 

Yes playing with different lengths of track, I think the truncation you get
at the end depends on how much has to be truncated to make it the correct
length after the unwanted pasting has been done. 
       
   
Thanks 

Gale 


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