All the stuff you mention (including libquicktime) have been added to the derivation I wrote a few messages above (see the file libquicktime/default.nix?). Just take 15 seconds to paste them in a random folder with the name I provide, and type the command I provide, and it should work 
Whoa, you’re awesome! 
How is it possible that the libquicktime “just works”? I got some complaints about some library being “insecure”. The Debian folks have added a number of patches over the past decade to resolve some of the issues, see here:
https://sources.debian.org/patches/libquicktime/2:1.2.4-12/
Oh no idea, but I’ve not tried to run the software as it seems to need some special hardware. Maybe the patches are needed at runtime and not at compile time? Or for security issues that are not appearing at compile time? Note that it’s usually quite easy to add patches using… patches
Yeah, I have seen how to apply patches. Need to arrange them properly yet.
You are right about the hardware. There is an option ‘-h no’ to indicate that you want to run without hardware. It crashes currently because some schema files need to be copied someplace. I will figure it out. I had already suspected that they would cause issues. Something about HowDoI/GSettings - GNOME Wiki!
BTW the superfluous libraries are a consequence of copying the nix file from some other project. Furthermore I just added anything that came my way that sounded somewhat reasonable to have.
This was already known to me and the reason why I had hesitated to provide the nix-files in the first place as I considered it bad style and embarrassing. 
Ahah no worries ^^ Actually I guess most of the time it’s better to start from a simple project and gradually add libraries when yoa need tgem, unless you have no idea how to go further, it avoids cleaning steps at the end ^^ But a dirty nix file is better than nothing Let us know if you manage to make it work, otherwise feel free to ask for some more help !