I've tested the beta version of the Video Splitter, but unfortunately the splitting of my test file (Video: Windows Media Video V8, video size 320 x 240 px, 350 kbps; Audio: Windows Media Audio V9.2, 48 kbps, 32 kHz, stereo) was not correct.
The splitted part started about 7 seconds too early, giving the impression that GOP splitting was performed, probably starting the fragment on the previous K-frame.