Are you sure you git cloned the correct branch ?, v2 is not allways default.It is now in VCV-Recorder, but if you cloned before, and just do git-pull you might not have changed the branch correctly(?)
“version” in plugin.json must match your rack major version. (2.*) - or they don’t show up in the browser.
Not sure if anything is in log.txt.
It is the smart thing, for sure. It’s much easier to transcode with ffmpeg after the fact.
Also, if you were to try this (sounds difficult!) I would look at what was done in the v1 plugin to make that work. The source code it still up there, just on a different branch, I think.