there are two parameters if I'm not wrong - --min-keyint which is minimal interval between keyframes, and --keyint that is max interval between keyframes. First is usually equal to fps of video, the second parameter can be 3x fps even 20 x is possible. Of course it has impact on skipping of videos. Larger more demanding on computing. It has to calculate all frame from nearest keyframe to current position. On slower machines it can take long time. But there are (on sw players (on PC)) usually possibility for fast skip, so when you skip at anywhere on video, it will play not exactly from position which you selected, but from nearest (previous keyframe).
Ексель очень мощный инструмент на самом деле
Даже без VB
Для прототипирования - самое оно
А если уж хочется делать не на нем, то для анализа ipython/jupiter и данные в csv
d3js - для визуализации в вебе