Of these, I'm pretty sure VLC is the most common software on end-user systems - and there are enough security advisories where a well-crafted video file can execute code with user privileges (like https://www.videolan.org/security/sa1801.html ), if you can automate that you have access to many personal computers in the EU
There's work going on (since 2016) to port the parsers to Rust[1]. I believe that a few already are written in Rust, and it'd be great if some Rust folks would help out with the effort.
GP isn't saying that VLC is unsafe, but rather that C (which VLC is written in) tends to be unsafe. Seeing as MPV is also written in C, it's absolutely the same in that regard.