Bug 506776

Created attachment 183069 [details]
The project file that exhibits the described problem

Fedora's problem reporting app lists the following after the crash:
mlt quit unexpectedly
7.32.0-1.fc42.x86_64
https://retrace.fedoraproject.org/faf/reports/bthash/24e05cae227ce92349a1e6c36af2c53054e93d13
--- Running report_uReport ---
('report_uReport' completed successfully)

--- Skipping collect_GConf ---
No matching actions found for this event.

--- Skipping collect_vimrc_system ---
No matching actions found for this event.

--- Skipping collect_vimrc_user ---
No matching actions found for this event.

--- Skipping collect_xsession_errors ---
No matching actions found for this event.

--- Running analyze_CCpp ---
Generating backtrace
Backtrace is generated and saved, 109961 bytes

--- Running analyze_BodhiUpdates ---
Looking for similar problems in bugzilla

Reporting is disabled because the backtrace has low informational value.

SUMMARY


STEPS TO REPRODUCE
1. Try to render WK.kdenlive. A project file with several mostly uncut video files using the Ut video codec that OBS uses when you choose for uncompressed video capture
2. Render the project in H.264 (not hardware accelerated) settings won't matter
3. Wait until render is at 99%

OBSERVED RESULT
The render will crash every time when the render at H.264 is almost finished at the very end in Kdenlive version 25.04.3. The rendered result seemingly is fine when played back.

EXPECTED RESULT
The render will finish succesfully.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.3-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
Memory: 32 GiB of RAM (31,2 GiB usable)
Graphics Processor: AMD Radeon RX 6700 XT

ADDITIONAL INFORMATION
I have tried reproducing this error in the daily build: kdenlive-master-10539-linux-gcc-x86_64.AppImage
The render worked just fine both times I tried. While using version 25.04.3, whether that is the Fedora Flatpak or the Fedora dnf packaged version both exhibit the described crash.
The version first reported in is set to 25.04.4 because 25.04.3 was not in the list.