Slpitting a .mkv file after a few seconds doesn't work properly

Hey,

I just recently learned that mkvtoolnix can split video files without re-encoding (after searching for ~1 hour online for a non shady looking program for exactly this task) despite using it for years ^.^"
It worked fine last week where I had to split some videos at about 20 seconds before they ended. But today I need to split a video just 12 seconds in. When I try to do so, mkvtoolnix only cuts the video after either 10 or 20 seconds, not my specified 12 seconds… I tried multiple time formats like “12s” and “00:00:12” and even on multiple mkvtoolnix versions 77.0 and the latest 78.0, but without success… Is this a bug?

Welcome!

mkvmerge can only split on key frames. Please see this FAQ entry for details. It’s not a bug but a limitation of mkvmerge is: a container-level tool, not a video decoder/encoder.