[FFmpeg-user] ffmpeg still to video question

[ffmpeg at jrbtechnical.com]

Hello:

I am looking to see if maybe I am missing an alternative to making a mp4
from still images.

I need the framerate of the mp4 (x264) to be 29.97, so I can't use the
typical "-r 5" that people suggest to slow down the animation.  I am
scripting things in perl with imagemagick, so I can easily create some
loops in the script to output 15 frames of each image, making a frameset
of a couple 100 frames, but that seems a bit "the long way around the
barn".  But, this may be the only way to do this.

I just thought I would check with people to see if there is something I am
missing in ffmpeg so that it knows to make 15 frames out of the same still
image before going to the next image in the still set, while creating the
output movie.  I have been looking around different forums and the
documentation, but not really finding anything that seems to work like
this.

Thank you for any help with this, if there is a solution other than
creating all the frames individually.

John