https://bugs.kde.org/show_bug.cgi?id=429920
Bug ID: 429920
Summary: Rendering video with Freeze effect on frame while
using Parallel Processing corrupts the frame
Product: kdenlive
Version: 20.08.2
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: h.k.gh...@gmail.com
Target Milestone: ---
SUMMARY
When I render videos that have a freeze frame effect on a clip's frame the
frozen frame ends up corrupted in the rendered video, but only when rendering
is done with the "Parallel processing" box enabled/checked.
STEPS TO REPRODUCE
1. Add clip to timeline
2. Grab one frame from the clip (preferably with movement before and after)
3. Add the "Freeze" effect to it
4. Render the project *with* Parallel Processing checkbox checked
OBSERVED RESULT
The frozen frame is corrupted (e.g. white, green, and/or otherwise visually
distorted). Audio appears to be fine.
EXPECTED RESULT
The frame looks correct, just like it did prior to rendering.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 20.10
KDE Plasma Version: 5.19.5
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2
Kernel Version: 5.8.0-31-generic
OS Type: 64-bit
Processors: 24 × AMD Ryzen 9 3900X 12-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: GeForce RTX 2070 SUPER/PCIe/SSE2
ADDITIONAL INFORMATION
I tested several settings (e.g. lower encoder speed slider, lower thread
count), but it made no difference. Only unchecking/disabling the "Parallel
Processing" checkbox produced the correct result.
I've seen this issue across several projects, with different sources/videos.
This is simply the first time I manage to narrow it down to something that
seems reproducible.
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