The plugin file is named FFMS2.dll (and the additional import script FFMS2.avsi); but the provided
primary functions to be used in your script are e.g. FFVideoSource or FFAudioSource.
Manual is here.
The set of provided functions may have changed during the development, e.g. there used to be a function FFmpegSource2 delivering an AudioDub result of video and audio together, first in the additional import script, now in the DLL.
Quote:
Note: the shorter FFMS2 alias was added in 2.22
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So check if you have a recent version.
...
Wait. I misunderstood. Reading again, it sounds like different steps of the script processing in MeGUI use different autoload directories, and thus different plugin versions...