ben_226218 (12/12/2018)
Thanks for that - I found:
A) only the AVI export format allows you to set the frame rate, and
B) that there's a scroll bar on the left to access the frame rate setting. The export button that high up in the dialogue frame makes it look like the end of the dialogue options.
Not sure what you mean by a scroll bar on the left, but to clarify, only AVI and Sequence Image supports custom frame rate. Both MP4 and WMV are fixed at 30fps.