At some point, I’ve resorted to reading the source code in order to find out which so-called MP4 atoms actually are supported and through which element names (the magic happens inside mov_write_ilst_tag() in moveenc.c). As Kdenlive uses ffmpeg for encoding, one would think that there’s plenty of information – unfortunately, it’s not, and the scarce information is sometimes plainly wrong. Of course, this may also apply to this Toolbox article, but I’ve taken much effort to cross-check things in real life. Unfortunately, information about what meta data can be used in which situation is rather scarce, sometimes outdated, and sometimes plainly wrong. We will come back to this difference in a second. Then, there is Apple iTunes, and that brings in a lot of meta data, and even changes the allowed set from time to time. The older, standard MP4 set is rather limited in what additional meta data can be used.
Unfortunately, there are competing sets of meta data when working with MP4 containers.
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