https://bugs.kde.org/show_bug.cgi?id=436941
Bug ID: 436941
Summary: Regression: Fading clips not working correctly in
rendered output
Product: kdenlive
Version: 21.04.0
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Effects & Transitions
Assignee: vpi...@kde.org
Reporter: die-...@elektrische-lasagne.de
Target Milestone: ---
SUMMARY
Fading a video clip in and out will not start to reveal the clip below.
STEPS TO REPRODUCE
1. Stack to video clips above each other (V1 and V2). The Clip in V1 should be
a bit longer
2. Let the clip in V2 "Fade in" and "Fade out" by dragging the left/right upper
corner of the clip towards the middle
3. Render this project
OBSERVED RESULT
In the rendered output movie: During the fading of the clip in V2 there will
only a black nothing instead of the clip in V1 below be shown. As soon as V2 is
fade out completely V1 will be visible abruptly by 100%.
This is not what the project monitor shows during real time playback (it
handles the fading correctly).
EXPECTED RESULT
The rendered output should be the same as the outout of the project monitor
during playback within Kdenlive: The clip in V1 should shimmer through when the
clip in V2 is faded.
SOFTWARE/OS VERSIONS
Linux: Arch/Kernel 5.12.1
KDE Plasma Version: 5.21.5
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
MLT Version: 6.26.1
ADDITIONAL INFORMATION
Problem occurs in Kdenlive 21.07.70 from git. And in 21.04.0 (official Arch
Linux package).
Tested with AMD ZEN Hardware + free Mesa Graphics AMD Stack. And on
Intel/Nvidia proprietary graphics stack.
Bug does not occur in Kdenlive 20.12.3 .
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