which ffmpeg ?

[lyapounov]

On my synology, I have so far the choice between three ffmpeg (there may be more)

1) the original synology
2) the ffmpeg downoaded from http://johnvansickle.com/ffmpeg/ 
3) the synology community ffmpeg

My options:
convOut=-af aresample=resampler=soxr:precision=33:cheby=1:dither_method=shibata


Number 1 is out because it does not allow for the soxr library
Number 2 is 49M in size
Number 3 is 267K in size

So far, I heard no difference between 2 and 3

Why this difference in size ?

Has someone here an opinion ?

Thx