Just wondered if anyone had a fix for this behaviour.
Audacity 3.2.4 on Windows 11. PC is i7 64GB RAM and about 500GB disk free.
I have a nearly two hour stereo track (44.1kHz - project file about 2.3GB). I need to speed it up by 4x so use Effects > Pitch and Tempo > change speed.
Put 4 in the speed multiplier box and apply. The process appears to work but then returns with what looks like an empty track.
The effect will work with shorter sections of the main track but I haven’t experimented to find the limit. I have used this effect with similar material in the past with a prior version of Audacity.
Could I be doing something wrong or is there a size/length limit with this effect?
If, after undoing, are you able to apply the effect successfully, or does it fail again? (Be careful when testing - ensure that you have a WAV file backup of any important audio, just in case it doesn’t come back.)
Here’s a test you can try that will test for one possibility (It checks for a specific kind of corruption).
Apply this code in the “Nyquist Prompt” effect to the entire track (it will be quite slow, but should return a pass or fail result).
For stereo tracks, you should see two “Pass” results (one for each channel)
(defun test (sig)
(setf count 0)
(do ((val (snd-fetch sig)(snd-fetch sig)))
((not val) (/ count *sound-srate*))
(if (/= val val)
(if (= count len)
(format t "Failed at ~a seconds~%" (/ count *sound-srate*))))
(multichan-expand #'test *track*)
A pass result does not mean that the track is ok/perfect, but a fail result shows that there is corruption in the track, and says where the corruption starts.