The new Kdenlive transition Composite and Transform will make basic compositing a lot easier for probably many Kdenlive users. But the new transition also allows for some nice and very easy masking effects...
rendering MP4 video including meta data in Kdenlive. This is very convenient, as you keep the meta data (such as title, author, copyright) in the best place: in your Kdenlive project. Unfortunately, the underlying ffmpeg handles only some, but not all (usable) of the iTunes-compatible meta data elements. Even worse, ffmpeg cannot add cover art. Time for another attempt: a Kdenlive post-rendering script...