SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. Set Project monitor preview resolution to 1:1 resolution. 2. Add vertical clip (9:16) to rectangle project (16:9) 3. Ad Fill borders effect to clip. 4. Adjust left & right values until clip borders are filled. 5 Change Project monitor preview resolution from 1:1 to 720p (or 540p) OBSERVED RESULT Fill border stops working and error pops up: [filter avfilter.fillborders] Connot configure the filter graph. EXPECTED RESULT For Fill borders to continue filling borders at a lower resolution. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: 5.115.0 Qt Version: 5.15.10 ADDITIONAL INFORMATION If you adjust the Fill borders values with Project monitor preview resolution below 1:1 Kdenlive is then likely to crash.