I don’t know the exact parameters but the automatic splitting is a bit more complex than just distance.
Here are some related conversations:
http://mapillary.trydiscourse.com/t/sequence-cut-had-cutted-a-lot-or-not/1876/57
And:
Yes, that is the process I mentioned earlier - but apparently, this needs to take not only the times, but also the compass angle into account. Will improve that script so we can make the below case working. [http://mapillary.trydiscourse.com/t/why-is-mapillary-breaking-everything/2142/3]