https://bugs.kde.org/show_bug.cgi?id=471280
Bug ID: 471280
Summary: Pitch compensation on clips sped up by ~1000% or more
may cause audio playback issues on those clips
Classification: Applications
Product: kdenlive
Version: 23.04.1
Platform: Microsoft Windows
OS: Microsoft Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: j...@kdenlive.org
Reporter: alexthornton9...@gmail.com
Target Milestone: ---
Created attachment 159799
--> https://bugs.kde.org/attachment.cgi?id=159799&action=edit
Short clip of the issue at 5% volume, occurred immediately after enabling proxy
clips (VOLUME WARNING)
SUMMARY
Pitch compensation on clips sped up by ~1000% (+/-100%) or more may cause audio
playback issues on those clips.
Random noise will play at random times through the right audio channel during
video playback, usually lasting less than 1 second, up to around 3 seconds.
Occasionally, the random noise plays for the entire duration of the clip, the
same noise repeats if the clip is replayed; restarting Kdenlive may change the
noise that plays back, but it will still repeat when the clip is replayed.
This random noise can be VERY loud.
Audio playback on the left channel appears to be normal.
STEPS TO REPRODUCE
1. Create a new project
2. Add a clip to the timeline
3. Speed up the clip to 1000% and enable "Pitch Compensation"
4. Turn down your volume and play the video preview
Strangely, enabling proxy clips seems to more consistently cause the issue,
tested on an existing project with sped up video already on the timeline. In
this case the steps are:
1. Create a new project
2. Add a clip to the timeline
3. Speed up the clip to 1000% and enable "Pitch Compensation"
4. Open Project Settings and enable proxy clips
5. turn down your volume and play the video preview
OBSERVED RESULT
Random noise occasionally plays through the right audio channel, or for the
entire duration of the clip.
EXPECTED RESULT
Audio plays back normally at the speed selected.
SOFTWARE/OS VERSIONS
OS: Windows 10 Version 22H2 (OS Build 19045.3086)
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
ADDITIONAL INFORMATION
Playback works properly with pitch compensation disabled, at even higher speeds
Original files are 1080p 60fps .mkv files with 3 audio tracks recorded using
OBS Studio version 29.1.2
Maybe relevant OBS settings:
Recording Format: .mkv
Audio Encoder: FFmpeg AAC
Audio Bitrate: 320Kbps (per track)
Sample rate: 48kHz
Channels: Stereo
Video Encoder: NVIDIA NVENC AV1
Rate Control: CQP (Level 24)
Keyframe Interval: 2s
Preset: P7: Slowest
Tuning: High Quality
Profile: main
Look-ahead and Psycho Visual Tuning: enabled
Max B-frames: 2
System specs:
CPU: Ryzen 7 3700X
GPU: NVIDIA RTX 4090 Asus TUF
RAM: 64GB DDR4 3200MHz (CL20)
Storage: 2TB Crucial MX500 SATA SSD
Audio interface: Behringer UCA-202 USB interface
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