This can be fixed by a no-change rebuild of MLT against the new ffmpeg. This has been done in Ubuntu, and confirmed to fix the issue.
- Bug#963706: kdenlive with ffmpeg version 7:4.3-2 can't Re... Thom
- Bug#963706: kdenlive with ffmpeg version 7:4.3-2 can... Patrick Matthäi
- Bug#963706: (no subject) Rik Mills
- Bug#963706: kdenlive with ffmpeg version 7:4.3-2 can... Stephen Hwang
