[FFmpeg-user] how to select filter when configure for ffmpeg

[Soho Soho123]

Hi All,

I can see a lot of filters when I run configure --list-filters in ffmpeg folder.
But I do not know which one is necessary for me.
If I want to get video frame and send to remote client by ffmpeg and ffserver,
then which filter is necessary?
or ,
is there any document that describes the function of each filter?
I do not know the function of each filter from  the name of filter
that "configure --list-filters" output.
for example:
the filter "fps", what is the function of that?

Thanks!