SUMMARY Installation of kdenlive in current KDE neon User Edition 5.22 causes installation of both libmlt6 and libmlt-7-7. However, libmlt-data v.7 are installed. Kdenlive doesn't work with libmlt7 profiles. STEPS TO REPRODUCE 1. apt update && apt install kdenlive 2. Run Kdenlive 3. The dialog box to define path to MLT profiles appears. The only available profiles are in /usr/share/mlt-7/profiles. Enter this path. 4. In a new Kdenlive project try to add any video clip to the Project Bin. OBSERVED RESULT A error "Cannot open ... file" appears. The clip is not added to the bin. Kdenlive cannot work. EXPECTED RESULT No need to set up MLT profiles folder on the first Kdenlive start. Video clips are successfully added to the bin. SOFTWARE/OS VERSIONS Operating System: KDE neon 5.22 KDE Plasma Version: 5.22.4 KDE Frameworks Version: 5.84.0 Qt Version: 5.15.3 ADDITIONAL INFORMATION The problem is caused by wrong dependencies and common usage of libmlt-data package by both libmlt versions. Package: kdenlive Version: 4:21.04.3-0xneon+20.04+focal+release+build32 Depends: ... melt, ..., libmlt++3 (>= 6.24.0), libmlt6 (>= 6.24.0), ... // kdenlive should depend on specific version of melt Package: melt Version: 7.0.1-0xneon+20.04+focal+release+build11 Depends: libmlt-data (>= 7.0.1-0xneon+20.04+focal+release+build11), ..., libmlt-7-7 (>= 7.0.1), ... // this melt version is installed, it's incompatible with kdenlive Package: melt Version: 6.24.0-0xneon+20.04+focal+build9 Depends: libmlt-data (>= 6.24.0-0xneon+20.04+focal+build9), ..., libmlt6 (>= 6.24.0), ... // even if you hold melt version it tries to install the latest libmlt-data Package: libmlt-data Version: 7.0.1-0xneon+20.04+focal+release+build11 // it contains /usr/share/mlt-7/ which is incompatible with kdenlive Package: libmlt-data Version: 6.24.0-0xneon+20.04+focal+build9 // it contains /usr/share/mlt/ - the correct data If I hold both melt and libmlt-data versions to 6.24, kdenlive works. libmlt-7-7 should have it's own libmlt-data. kdenlive should not install melt v.7.
Thank you for your bug report! However this bug report was created/provided previous to 01/01/2023 and also has not received any updates since before 01/01/2025. Unfortunately KDE neon no longer provides updates for anything older than noble 24.04 based edition's. Please upgrade to KDE neon noble and if you can reproduce the issue after upgrading to an active version, feel free to re-open this bug report. Thanks for understanding!