While ripping an old cel-drawn cartoon series at a very good quality setting (over 300mb per 22min episode), I've noticed that some of the resultant files are 23.97fps and others are 29.97fps. I trace this (from the log-files) to AutoGK's estimation of interlacing, telecining and progression percentages; if it concludes "mostly film", is goes with 23.97, and if "mostly NTSC", then 29.97. The episodes are fairly similar to each other, and apparently the hybrids lie near an AutoGK cut-off point for determined which fps setting to use.

...is there any way to force is to pick one fps or the other, yet still use the information gained in the estimation phase?

(I've tested a 30-second clip at a 50% xvid setting in which AutoGK concluded "mostly NTSC" and produced a 6mb file w/23.97fps. However, if I *forced* it to 23.97 using the F9 > Reduce FPS settings, then it skipped the estimation phases and produced a 7.5mb file even though, according to the log, it had the same number of frames -- obviously an inferior result.)