https://bugs.kde.org/show_bug.cgi?id=488038
Bug ID: 488038
Summary: Glitchy audio when I try to revert audio that was
previously reversed
Classification: Applications
Product: kdenlive
Version: 24.05.0
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: Effects & Transitions
Assignee: j...@kdenlive.org
Reporter: silas...@gmail.com
Target Milestone: ---
SUMMARY
A while ago I had taken some audio from my friends and used Kdenlive to turn
them backwards, as a joke.
But yesterday, when I tried to revert them again and get them back to normal,
it didn't work and Kdenlive only rendered noises.
The strangest thing is that when I try to reverse these audios using another
program, the audio is reversed correctly and I get the original audio. I tested
using the website https://audioalter.com/reverse
STEPS TO REPRODUCE
1. Place any audio on the Kdenlive timeline
2. Under “change speed” check the “Reverse clip” box.
3. Render the audio as mp3. Works as expected. Let's call this file
reverted.mp3
4. Insert the reversed.mp3 file into kdenlive and try reversing it a second
time to get the original audio back.
5. Now the audio has become just noise. It's not just in preview, but when
rerendering as mp3 (like double-reverted.mp3) it still doesn't work.
6. The strangest thing is that there is nothing wrong with the first reversal.
If you take the reversed.mp3 file and try to reverse it again using another
program like https://audioalter.com/reverse it returns to the original audio
correctly.
I made an example video showing the problem, edited entirely in Kdenlive:
https://www.youtube.com/watch?v=qc9x6Yr62VY
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.2.0
Qt Version: 6.7.1
ADDITIONAL INFORMATION
ffmpeg version: 6.1.1
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