Gale (Audacity Team) wrote:
>
>>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.
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.
To see this, I generated a signal similar to yours in amplitude but
using chirps and noise. In Spectrum view it is then obvious what is
going on.
HTH
Martyn
> 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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