Apologies for the top post. I noticed this email and wanted to point you to prior work, in case it proves useful:
https://issues.guix.gnu.org/31307#14 On Thu, Sep 22, 2022 at 12:24 PM Maxime Devos <maximede...@telenet.be> wrote: > > > On 22-09-2022 13:38, Dr. Arne Babenhauserheide wrote: > > > > Tobias Geerinckx-Rice <m...@tobias.gr> writes: > > > >>> can I express "any version of ffmpeg"? > >> > >> No, this would go against the goals of Guix: packages can't depend on > properties of the environment they'll end up in (if any). > > > > What’s the right way to deal with this, then? I need ffmpeg at as > > propagated-input, but I do not want to create a conflict with a manifest > > that just defines "ffmpeg". > > In one my replies, I have proposed a method that avoids propagating ffmpeg: > > > To avoid profile collisions when the user installed a different version > of ffmpeg (e.g. ffmpeg@5) in their profile, could you modify the code to > look at a /gnu/store/.../bin/ffmpeg instead? Likewise for bubblewrap, > gdk-pixbuf, poppler and librsvg, if feasible. > > > > For ffmpeg, the following function needs to be modified: > > > > https://0xacab.org/jvoisin/mat2/-/blob/master/libmat2/video.py#L139 > > > > (substitute* + search-input-file can be useful). > > Greetings, > Maxime. >
