Simple command line Python script that splits video into multi chunks. Under the hood script uses FFMpeg so you will need to have that installed. No transcoding or modification of video happens, it just get's split properly.
Run python ffmpeg-split.py -h to see the options. Here are few samples of how it could be used:
python ffmpeg-split.py -f big_video_file.mp4 -s 10
This splits big_video_file.mp4 into 10 chunks. Each chunk will be suffixed with numeric index, for example big_video_file-0.mp4, big_video_file-1.mp4, etc.