Hi,
I'm having trouble using the hum filter. The recording is 2 channel and 2.5 hrs long, and I'm trying to take out hum with a setting of 4 odd, 1 even harmonics, default 10% sensitivity. At almost exactly halfway through (on the progress bar), the process freezes, and I get "Audacity failed to read from a file from D:" (D: is my temp disk and has 40G spare).
If I run using the debug button, it does the same with an empty dialog box at the failure point. The machine is Win 7 running latest 2.2.1 and has 12G RAM. I have re-created a project from scratch, reimported the source file with the same results. Other hum remover settings result in same.
As a workaround I can perform the filtering if I do it in 2 separate passes, start -> halfway and halfway -> end, so it looks like some kind of capacity limitation.
Possible bug/limit in hum remover filter
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This forum is for Audacity on Windows.Please state which version of Windows you are using,
and the exact three-section version number of Audacity from "Help menu > About Audacity".
Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade at https://www.audacityteam.org/download/.
The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.
Re: Possible bug/limit in hum remover filter
This is a problem that affects a lot of Nyquist plug-ins (but not all).
Unlike built-in effects, Nyquist effects do not have arbitrary access to the audio data - they can read a track selection once, from the start of the selection to the end of the selection. Some processes, notable those that require analysis before the effect is applied, need to access the data more than once, and the only way that they can do that is to retain the data in RAM. However, because Nyquist is running in a 32-bit environment, the limit to the amount of data that may be addressed in RAM is 2GB. Thus many Nyquist effects break beyond an hour and a bit.
I'm a bit surprised that this problem occurs with a filter plug-in. Where can I find that plug-in?
Unlike built-in effects, Nyquist effects do not have arbitrary access to the audio data - they can read a track selection once, from the start of the selection to the end of the selection. Some processes, notable those that require analysis before the effect is applied, need to access the data more than once, and the only way that they can do that is to retain the data in RAM. However, because Nyquist is running in a 32-bit environment, the limit to the amount of data that may be addressed in RAM is 2GB. Thus many Nyquist effects break beyond an hour and a bit.
I'm a bit surprised that this problem occurs with a filter plug-in. Where can I find that plug-in?
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