[Feature Request] Support for `select` and `setpts` video filters

[Itamaram]

I am looking to use FFMpegCore in order to extract a clip out of an existing video using the cli equivalent of
-vf select='between(n,0,100)',setpts=N/FRAME_RATE/TB"

At the moment I achieve this by using the WithCustomArgument method, and it is working well, however I was hoping there's a slightly more managed way to achieve the same goal.

Is there any particular reason this is not currently supported by the library?

[rosenbjerg]

There is no particular reason these videofilter arguments are not more directly supported, other than the fact that this library does not aim to support all ffmpeg arguments directly as that would too complex for a wrapper library. Instead, the aim is to support commonly used arguments and then support the remaining indirectly but still conveniently, i.e. through WithCustomArgument