https://bugs.kde.org/show_bug.cgi?id=464558
Bug ID: 464558
Summary: When speeding up playback, audio is severely distorted
Classification: Applications
Product: kdenlive
Version: 22.04.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Video Display & Export
Assignee: j...@kdenlive.org
Reporter: domdomegg+...@gmail.com
Target Milestone: ---
SUMMARY
When speeding up playback (for example with the >> icon underneath the Project
Monitor, or hitting the 'L' key), audio is severely distorted. It seems to have
a static noise and tiny skips.
STEPS TO REPRODUCE
1. Start playing a video in the timeline
2. Increase the speed to 2x using the 'L' key
3. Listen to the audio
OBSERVED RESULT
Audio plays back with static and skips. It seems particularly bad with voices
speaking.
EXPECTED RESULT
Audio plays back correctly.
IMPACT
This makes editing long videos more difficult, because it's hard to watch them
back quickly to either find the most important parts or identify parts that
need editing.
SOFTWARE/OS VERSIONS
Kdenlive: Kdenlive Version 22.04.3, using MLT version 7.8.0
OS: Ubuntu 20.04.5 LTS
ADDITIONAL INFORMATION
- This has been noticed by others since 2018, but I couldn't find a formal bug
report: https://forum.kde.org/viewtopic.php?f=279&t=151473
- This has also been recorded in other bugs, e.g.
https://bugs.kde.org/show_bug.cgi?id=455563 (which you can hear the static in
when it is at 2x speed)
- It's clear Kdenlive can play back videos at a faster rate without this static
effect: using the 'Change Speed' dialogue with Pitch Compression gives the
desired result.
- Demonstration here: https://youtu.be/09h__B7XhpU
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