VSE: Additional copy of audio strip appears in memory after undoing when using proxy and splitting #78835
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Reference: blender/blender#78835
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System Information
Operating system: Linux-4.9.0-12-amd64-x86_64-with-debian-9.12 64 Bits
Graphics card: Gallium 0.4 on AMD KAVERI (DRM 2.49.0 / 4.9.0-12-amd64, LLVM 3.9.1) X.Org 4.3 (Core Profile) Mesa 13.0.6
Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-10 20:07, hash:
d2b910fafe
Worked: (newest version of Blender that worked as expected)
Short description of error
This annoying bug with audio strips seems to affect Linux systems only. At first I thought that it's random, but then I noticed that it appears right after using undo. After several hours of investigating I narrowed down its cause to 3 triggers that have to be used together: using proxy, splitting movie strips and then using undo.
I recorded a screencast with the steps to reproduce the bug:
http://neoncipher.net/blender-audio-bug.mp4
I hope my amateur investigation will help to find the root of the problem.
Exact steps for others to reproduce the error
This bug is hard to reproduce, so please follow these steps strictly without doing any additional clicks/commands, on Linux. With those steps I managed to get the bug every single time.
If you mess the steps, it's necessary to restart Blender and start from the beginning. Do not use undo, except when it's in the steps:
So the fact that this bug only appears when using proxy, tells us that maybe video strips are involved in its cause.
The bug seems to be affecting only memory. If you save this file, after restarting Blender, the additional audio strip from the memory goes away.
Added subscriber: @neoncipher
#79280 was marked as duplicate of this issue
#78216 was marked as duplicate of this issue
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscribers: @Lynerlok, @NiceMicro, @iss
I was able to reproduce this issue (on windows) and now I am not able to reproduce anymore. But during last editing session I have experienced this bug, so I should be able to make fix. But I need to collect some material to edit first.
@iss Using additional undo (before or after the steps) can prevent from reproducing the bug. Also, I figured out another set of steps to reproduce this issue. It doesn't even involve applying effects to strips. Just moving them. Do you need me to post the new steps? Also, please, let me know if you need any help with the material or testing. I hope this can be fixed soon. This bug prevents me from using undo during editing, which is very annoying.
@neoncipher If you have simplified steps you can update them though this is really tricky to catch so steps perhaps don't apply if code has changed a bit? not sure really.
@iss I've been experimenting with the issue and found that moving strip parts that were split, then undoing several times, produces the bug every single time I try it if using proxy.
Also, note that this bug appears in 2.83 and 2.90 only. Everything works correctly in 2.82.
Maybe those steps will work better:
If you mess the steps, it's necessary to restart Blender and start from the beginning. Do not use undo, except when it's in the steps.
Added subscriber: @cbrash
This issue was referenced by
1e7afea2bb
Changed status from 'Confirmed' to: 'Resolved'