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.