Location of ffmpeg options

John, thanks for your reply.
Part of the problem is/was neither ImageMagic, nor ffmpeg was installed via the distro, and we are using shared hosting.
The second which prompts the configuration question, is we would like to assure that ffmpge does not use the first few frames of a video which can be a blank leader. There is a straight forward cli option for this, hence the query as to where we can access the options.