Change Tempo Effect Crashes

[Brian Smith]

Thanks Steve, I look forward to the new release. Sorry to report that crashing returned today when I applied Change Tempo to a 1h 1m 11s file. After several occurrences I reinstalled v3.0.0. Change Tempo doesn't crash but fails to take effect. The only change before the crashes is that yesterday I enabled the VyNil plug-in to experiment sometime. I've since disabled it but that didn't cure it. I can get around the issue so I don't need to regress to v2.4.2. I offer this because I remember from my developer days that the smallest thing can have the biggest effect!

[steve]

Ensure that none of the audio tracks start before time=0.0
(audio in "negative time" has been found to cause problems for some effects in Audacity 3.0.0)

[Brian Smith]

I regret to say v.3.0.2 has not fixed this issue.

[waxcylinder]

I regret to say v.3.0.2 has not fixed this issue.

I just tested on W10 with 3.0.2 and the latest alpha test build that I have and Change Tempo works fine for me (and does not crash) on a one hour stereo project.

And works fine on 3.0.0 too.

Update: but if I Timeshift the waveform so that some of it is negative time - then Audacity crashes at the end of attempting the Change Tempo.

This is a bug (we don't like crashes) - I need to test with some other effects, particularly the Change **** effects - and then I will log this.

So there are a couple of workarounds:
1) ensure all your audio is in positive time if you want to use Ctrl+A to select all the project before applying the effect
2) Or zoom to fit the window and use click&drag to select just the audio that is in positive time - with click&drag you can't select in negative time

Peter.

[Brian Smith]

Interesting, I'll experiment to see the longest length I can change tempo without a total crash.

[waxcylinder]

Interesting, I'll experiment to see the longest length I can change tempo without a total crash.

See my previous post Update (written as you were writing) about audio in negative time causing the crash.

Peter.

[waxcylinder]

Logged as P1 regression bug (it's a regression on 2.4.2) Bug #2574
https://bugzilla.audacityteam.org/show_bug.cgi?id=2754
Change Tempo & Pitch with selected audio in negative time crash Audacity on windows (error on Mac)

Peter.

[Brian Smith]

Thanks, I remember that point earlier but none of the audio is in negative time (see screen shot). I changed individual segments(?) to achieve the exact hour.

Untitled.png (86.01 KiB) Viewed 103 times

[waxcylinder]

Thanks, I remember that point earlier but none of the audio is in negative time (see screen shot). I changed individual segments(?) to achieve the exact hour.

Well that's me stumped on your use case then Brian - I can't make an hour of stereo fail with Change Tempo it it's all in positive time

I even tried adding a load of clip boundaries as you have - but it still works OK for me.

But many thanks for helping me discover the Windows crash bug

Peter.

[Brian Smith]

If it helps, the progress bar moves to within a whisker of the end, then Audacity 'thinks' for a second or two before disappearing from the screen. No error message is displayed. Restarting Audacity offers to restore the open projects (successfully) to the state before attempting the change.

Many thanks for your efforts, Peter. I can work around it but please keep it in mind.