Free or nearly free software for clipping large/ 1080p mkv files on mac

[thedivinegoat]

Trying to vid for the first time in years, and I've gone back to MPEG Streamclip for clipping purposes, but as well as no longer being as stable as it used to be, it doesn't seem to be able to deal with large .mkv files.

I have no problem clipping the .mkv that are around 1 gb 720p but can't deal with .mkv files that are around 4gb 1080p. (I'm not technically savvy enough to know whether it's the size or the encoding it's having an issue with).

Any recommendations for for newer software that might deal with files better? (I'm using Lightworks for the actual vidding)